16. Human Sexual Behavior II


  1. Polydopamine said:

    Sexuality in general was not repressed and it was embraced and nurtured. Through their myths, relegion, festivals, art, literature and sports.

    July 27, 2013
  2. lllCockroachlll said:

    I didn't say that that heterosexuality was considered 'wrong' at that time, if that's what my post seemed to suggest. Thanks for the clarification. Now (6 months later) I think that in Greece there wasn't the concept of sexual orientation homo/hetero that we have today, correct me if I'm wrong. Does that mean that bisexuality was common at that time? In that case, could that mean that a culture that embraces any sexuality generates bisexuality? (i.e. culture might influence sexual orientation)

    July 29, 2013
  3. Polydopamine said:

    Bisexuality and homosexuality were only recorded so often and via different mediums (paintings, literature, satire), because sexuality in general was embraced and different sexual orientations were not looked down upon/ridiculed. Homoerotism was still the less frequent sexual orientation, prompting many instances of satire just like anything less common and peculiar at the time. You can experience the same phenomenon now

    July 29, 2013
  4. Polydopamine said:

    In socioeconomic systems where freedom of expressing oneself is a constitutional right, your observations would be similar, if not the same.
    Regarding pedophillia in Ancient Greece, something similar is the cause for the horrid misconceptions. Just because they recorded the instances of pedophillia and didnt hide them like some cultures -even nowadays- do, doesnt mean that the instances of pedophillia were more frequent or that their culture was enabling pedophillia.

    July 29, 2013
  5. Polydopamine said:

    If you take the time to rewatch Mr. Sapolsky's lectures, you will soon see that culture has little to do with sexual orientation and the former influencing the latter to any considerable degree is rather unlikely.

    A culture that embraces any sexuality enables the different sexualy oriented people to speak out, not feel ashamed and demonstrate sexual behavior. Thusly, creating the common misconception that they were created by the societal factors and the social dynamics of that region.

    July 29, 2013
  6. S. Vaughan Merrick said:

    the transcript is hilarious – clearly this was not remotely edited!

    October 27, 2013
  7. özge özçelik said:

    weaving jacquard loom = patterns, intricate intrinsic random intricacies, subtleties, complexities = emerging of layers = sister literature … 

    December 13, 2013
  8. DWillyB said:

    Sapolsky is an instructor without peer, but…  I believe he's off when he buys into the myth of the "chastity belt."  These contraptions were voluntarily worn by women to prevent rape (predominantly when traveling).  A woman would be doomed to death by infection if she could not access its removal and cleaning after short durations.  

    June 12, 2014
  9. JiveDadson said:

    Female boars?

    September 10, 2014
  10. Buysome Bitcoin said:

    drives a volvo, has a golden retreiver.

    November 9, 2014
  11. Maryam Fallahi said:

    Can someone please tell me what is the " zebra book" that he keeps referring to? thanks.

    January 25, 2015
  12. Maryam Fallahi said:

    Thank you very much.

    January 25, 2015
  13. Robert Begusch said:

    people who were males prenatally who then were raised female:  isn't it their adoption of an identity (female) which causes them to unconsciously act out the identity (female).  This is a bit more of a refined view than the "social cueing".

    March 21, 2015
  14. Tl Howard said:

    I like the good doctor, but man, his vocal intonation pattern is maddeningly irritating.  IT's too predictable for the human ear to bear.

    April 20, 2015
  15. Jai Cilento I Love That Guy ʕ•ᴥ•ʔߛ ̋ said:

    10:00 Male Male & Isolation Fx on Trone & Mood

    May 6, 2015
  16. Jai Cilento I Love That Guy ʕ•ᴥ•ʔߛ ̋ said:

    47:50 Iff Organising Fx PreNate Trone Th Later expur M beh =1

    May 6, 2015
  17. Jai Cilento I Love That Guy ʕ•ᴥ•ʔߛ ̋ said:

    57:30 Estrogen Causing Male Program'd Beh

    May 6, 2015
  18. Jai Cilento I Love That Guy ʕ•ᴥ•ʔߛ ̋ said:

    1:05:00 No Gay Gene

    May 6, 2015
  19. Jai Cilento I Love That Guy ʕ•ᴥ•ʔߛ ̋ said:

    1:15:00 Our Closest Genetic Relative

    May 6, 2015
  20. Seán O'Nilbud said:

    1:14;43 Not a single w00t, tsk.

    August 2, 2015
  21. Michael Bvxonide said:


    November 14, 2015
  22. OrphanPaper said:

    a boar is a male a sow is a female pig

    November 24, 2015
  23. xuandaidalat2010 said:

    41:00 how do you explain incest and molestation?

    December 21, 2015
  24. george mira said:

    Congenital adrenal hyperplasia
    coming soon
    – more T!

    May 15, 2016
  25. Damon said:

    Dr. Sapolsky is an absolutely perfect looking college professor!!…Oh, and he is an excellent lecturer as well 🙂

    June 14, 2016
  26. Damon said:

    If I were to attend Stanford, I would take EVERY course instructed by Dr. Sapolsky. He creates such an interest in what he is about to say, where you gladly join him in his journey through his lecture.

    June 14, 2016
  27. GetSomeRest said:

    This guy's beard growth rate accelerates

    September 6, 2016
  28. Ardis Cani said:

    which one is that "zebra's book" that he keeps mentioning?

    September 18, 2016
  29. Sergey Tolkachev said:

    This lectures are amazing!! Can someone recommend a good book about human sexual behavior?

    October 11, 2016
  30. Travis Croy said:

    I really must say I love this mans lecture. It is well delivered and well rounded.

    October 17, 2016
  31. Vincent Perling said:

    Clearly explains sexuality. Even throws in humor.

    October 30, 2016
  32. Piero Reverberi said:

    1:03:30 There is a pretty big mistake about testicular feminization sindrome,which should be more precisely called androgen insensitivity syndrome (AIS) that is incoherent with everything said before about transgender individuals:
    as stated before transgender individuals actually have the brain of what they feel like (or more similar to it), so they identify with that gender even though they were raised as the opposite one, which is proof that social conditioning and phenotype as male/female is not enough to make a child "feel" as male/female .

    Now he is saying that AIS XY (female phenotype, male cromosomes) people identify as female because of social conditioning even though they have a fully masculinized brain.

    This makes no sense, the actual reason they, in the majority of cases, especially in complete androgen insensitivity syndrome (CAIS) identify as female is that their brain is actually female, as proven by a recent article, and the reason is that whereas in rats only estrogen converted locally in the brain from testosterone plays a role in the masculization process, in humans androgen receptors play a key role (testosterone plays a direct role).

    for more details see
    source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2706155/

    January 6, 2017
  33. Ace H said:

    this one was confusing and there was lot of stuff to take in, have to rewatch

    February 18, 2017
  34. Nichole said:

    Listening to him makes me so happy…

    May 13, 2017
  35. Abdulkader Abdulrazzak said:

    I had a certain understanding of evolution that I carried along for a long time and I used to always argue with and the picture was of a uniform linear model. advantageous traits simply would keep evolving rapidly through the selection of more magnified and amplified version of genes replacing the weaker ones. but the realm of social evolutionary biology is much much more complex than that. I wish I can have the honor of thanking doctor sapolsky personally as this course was one of most enjoyable experiences I had on youtube, and it truly changed the way that I view the world. Thank you doctor sapolsky. Abdulkader from syria

    May 27, 2017
  36. bandicootrandicoot said:

    i don't watch porn anymore

    June 17, 2017
  37. mattyjmar10 said:

    24:53 "Can you image that money was being spent on that – your research dollars – instead of strafing people in Kandahar province or something." If only more dollars were allocated that way… :'(

    July 15, 2017
  38. innerbeing1983 said:

    Hey guys, which Sapolsky book should I read first? I love these lectures!!! Thanks!

    July 20, 2017
  39. mymadmother said:

    Why not, science calls for faith too

    September 3, 2017
  40. John S said:

    This is yet another outstanding lecture. Societies vary in the degree to which men use power to control women's agency. There have been regimes (e.g., Taliban) that are obsessed with doing so. Wouldn't concealed ovulation increase male guarding and paternal investment? If he doesn't know when she's ovulating in a pair bonding species he's got to hang around. Copious menstrual discharge is a signal of non-pregnancy. I'd think both of these have more to do with the domestication of males (giving them incentives from fooling around). Who knows?

    September 18, 2017
  41. Great Moose Detective said:

    So i just learned that this human pheromone theory is basically a myth, completely unsupported by evidence. No study has identified a human pheromone or reception mechanism. No study has shown that female humans synchronize ovulation.

    And this seems to be a theme with professor Sapolsky, he repeatedly cites studies that could be true but have never been repeated (i.e., are not science) and sometimes cites studies that are widely rejected in the scientific community for methodological criticisms.

    He tends to overstate the confidence scientist have in a study when it aligns with his beliefs, while he is very dismissive of studies which are much more widely accepted. In the modern 'publish or perish' academic environment, publishing a study with controversial results can be the difference between a researcher getting their foot in the door with a reputable scientific research institution or taking a job as a potato chip seasoning engineer. There's just too much incentive for confirmation bias to draw any confident conclusions from some of these studies.

    Make sure you read these studies for yourself, before you repeat what the professor says. He's very good with the primatology and neuroscience, but some of the stuff he says about humans definitely should not be taught as fact.

    December 3, 2017
  42. Seyton said:

    What I'd like to know is what taught him (where he got the idea) how to raise healthy (mind) family?

    December 22, 2017
  43. jemielnic said:

    so great that out there are people which carry on studying human behaviour, sexual dimorphism, gender differences etc.
    With current, dominating pc/sjw dogma, most of universities are persecuted just like all those medieval geniuses – Galileo, Angelo, Da Vinci etc – are persecuted by church state.

    January 9, 2018
  44. Jeffrey Craig said:

    23:00 For the second rise in female sexual receptivity, does this take into account if a female does not keep count of when her period is about to come/when she last had her period? (without the mindset of "my period is about to come now I can have sex more safely")

    January 12, 2018
  45. James Nelson said:

    Sexy erect black nipples !!

    January 16, 2018
  46. unity2 the mysterious traveler said:

    amazing eye opening stuff ,thankyou ,

    February 10, 2018
  47. Keo gh said:

    Anybody found those classics by Dr.Anonymous?

    February 18, 2018
  48. Correctrix said:

    10:26 Missed a golden opportunity to stroke his chin and say, "I shaved yesterday".

    February 26, 2018
  49. Patricia Heil said:

    Yes, I googled it. (on the farm), Mrs. Coolidge was taken to a large enclosure with a henhouse, filled to capacity with hens and little chicks, but she could see only one rooster. When she remarked about it, the farmer boasted of his “prize” rooster – one able to “service” the entire lot. She queried, “Just how many times a day does this prize rooster ‘copulate’?” When told that rooster could mate perhaps 35-40 times a day, Mrs. Coolidge twinkled to her host, “You must be sure to tell that to President Coolidge when he passes this way.”
    Sure enough a half hour later, the President and his escorts passed that same henhouse, and was given Mrs. Coolidge’s “message.” Coolidge nodded, and was his usual silent self, until they were about to leave the area.
    “Hmmmm. Thirty or forty times a day,” he twanged. “Same hen?” “Oh no,” said the farmer, “he services them all.” Coolidge didn’t miss a beat. “You be sure to tell that to Mrs. Coolidge,” he added. (From Presidential History Blog)

    April 20, 2018
  50. Keerthana Gurushankar said:

    plug for shinsekai yori is in cue here

    May 7, 2018
  51. AaAaAaAaAaA said:

    survival of the beardiest

    May 7, 2018
  52. Сухоненко Екатерина said:

    Does anyone know any research about the attractiveness of a large jaw and a high forehead? Or something like that?

    June 12, 2018
  53. the chav said:

    Does anyone know where I can find that paper by doctor anonymous and beard growth?

    June 13, 2018
  54. slappadabass said:

    "Males attempt control of female sexuality. Bad. Females hide their ovulation and trick males into having offspring. Brilliant." These lectures were great but I'd really love to hear the facts without the professor's feminist social justice opinions.

    July 17, 2018
  55. Khai Bing Vu Tkhi said:

    Can somebody tell me the full name of this course, please!? And the textbook for this book also please!

    August 19, 2018
  56. SassyHershsey SassyHershey said:

    straffing people is not biology is it? Or is that about aggression, …You get hard when the VC are out in the open and You have a rifle on them" Vietnam War Veteran"

    August 29, 2018
  57. Good Snacks said:


    September 2, 2018
  58. Scotious Nevious said:

    It should be a crime that people get access to these vids for free.

    September 3, 2018
  59. Cosa Razvan said:


    September 11, 2018
  60. Kimberly Wolenski said:

    This guy is so interesting. One video started to autoplay and now I'm on my 5th vid.

    September 18, 2018
  61. shiny x said:

    Chastity belts are largely a historical myth. You wouldn't be able to keep yourself clean wearing them for a few days, let alone 6 years.

    September 19, 2018
  62. Jim Stanley said:

    Coming from someone that spent more than 10 years at various secondary and university educational institutions (studying completely different fields) . . .

    This guy is a brilliant lecturer.

    October 2, 2018
  63. Jim Stanley said:

    13:47 – Giraffe's Gustatory Information; flehmening.

    October 2, 2018
  64. Hannibal Tate said:

    Whats the best advice you guys got out of this vid? Please like, and comment thanks.

    October 5, 2018
  65. Redwood Madrone said:

    Big thanks to the “evolution” of our society!

    October 8, 2018
  66. Redwood Madrone said:

    Big thanks to the “evolution” of our society!

    October 8, 2018
  67. John said:

    When Stanford beat University of Oregon last week my Testosterone level plummeted…I am a Duck fan.

    October 11, 2018
  68. M. Khaled Badenjki said:

    Thank you Sir.

    October 13, 2018
  69. Gregory Russ ell said:

    Cool Humor. Lap dancers get bigger Tips..lol

    October 15, 2018
  70. Shadowhands 33 said:

    he he… the infamous lapdance studie..maybe not your corner but by now definetly a science pop culture legend^^

    October 22, 2018
  71. Shadowhands 33 said:

    chastity belts were not really used and there is not any evidence for the use of them…….thats an urban childs book legend^^

    October 22, 2018
  72. Amy Jie said:

    Around the 103:00 mark about social conditioning playing a large role in someone's sense of gender brings up two questions that I would like to see addressed:

    1. What if, as mentioned earlier, it's an organization-activation effect? As in the testicular feminized males have the male brain organization but no testosterone to activate the pathways?
    2. What about all the inter-sexed or poorly endowed male babies that were "converted" to women at birth and strongly identified as male despite being told they were a girl and having girl genitals their entire life?

    December 14, 2018
  73. Dean Howell said:

    What is exclude to you tube in the last two lectures?

    December 23, 2018
  74. WTF how bizarre said:

    is human oral sex gustaning?
    is it also gustaning in bonobos?

    December 24, 2018
  75. WTF how bizarre said:

    why do SSRIs lower libido in women and give men E.D.? As if a person with Major Depression needs a reason to be Depressed about.

    December 24, 2018
  76. Michael Weekley said:

    Cabbage start?

    January 1, 2019
  77. Jen B said:

    lmao "I'm not drawing that!!"

    January 6, 2019
  78. Chica 411 said:

    I dont know about anybody else but I'm going for some sex with my hubby after this videos over

    January 18, 2019
  79. Samuel Whitley said:

    female boars?

    February 24, 2019
  80. nathan wind said:

    I don’t see what you guys see. He talks too fast and never changes his tone, so as to stress particular points. Good content, hard to listen to for an hour and 40.

    March 5, 2019
  81. Feelit Believeit said:

    1:29:46 WRONG, see Sex at Dawn for numerous examples of human foraging cultures that do not commit male-male violence over female sexuality. Overall a very interesting lecture, but the field has advanced considerably in the last decade. Sex at Dawn refutes the standard model of humanity evolutionary psychology, which this lecture is firmly based on

    March 12, 2019
  82. l l said:

    51:23 What happened to the sound there?

    March 17, 2019
  83. Rainuriftiann EhziraElwancen said:


    April 26, 2019
  84. David AL said:

    i am addicted to science and this professor like my best friend, these type of people i love to hangout around and learn , for me he is the best Doctor and i kinda teach and explain for people the same way he uses

    May 17, 2019
  85. Cryptus kereem said:

    Somebody know which book he mentions at 16:15 -ish?

    June 10, 2019
  86. P Kuehbauch said:

    Polydopamine, you are wrong. Homosexuality between adult bearded men was disdained in Ancient Greece.

    June 14, 2019
  87. MrLovaskocsi2 said:

    yo, what is up with that chart at 1:21:21 ???

    June 24, 2019
  88. Michael Berg said:

    hey!! film the charts on the board! dont always need a close up on him!! but… either way.. thanks!! appreciate the vids!!

    June 25, 2019
  89. G Town Dave said:

    Dr. Sapolsky is the consummate professor.

    July 10, 2019
  90. pecosRoy said:

    i don't understand why it might be false to think we are motivated by the proximal effects of sex (hedonic pleasure) into fulfilling its distal effects (procreation). or is this a 'chicken & egg' sort of question?

    July 22, 2019
  91. Lee Gee said:

    Thank you

    August 8, 2019
  92. Dfd_Free_Speech said:

    29:46 "So does testosterone actually have a causal role in increasing the likelihood of male sexual behavior?"
    Yes, it does. And it does do so massively:

    "Testosterone is critical for sexual desire, function, and arousal in men.[20][21] Aromatization of testosterone into the estrogen estradiol appears to be partially responsible for the effects of testosterone on sexual desire and function in men.[22][23][24] 5α-Reduction of testosterone into the more potent androgen dihydrotestosterone (DHT) may have a small contribution to the effects of testosterone on sexual desire and function in men.[25] Based on animal research, metabolites of DHT including the neurosteroids and weak estrogens 3α-androstanediol and 3β-androstanediol may be involved in sexual function in men.[26][27][28]"

    Then, Sapolsky tries to make us believe that – contrary to ALL other hormones – it would not play a role whether we see 10% or 200% of normal testosterone levels.

    "But those brain regions are not really all that concerned with the exact level of testosterone."
    Sorry, but the claim that it would not matter if you have 10% or 200% of normal testosterone levels is utterly, utterly wrong.
    Actually even little differences seem to matter A LOT:

    "Men experience sexual dysfunction at testosterone levels of below 300 ng/dL, with men that have levels of testosterone of approximately 200 ng/dL often experiencing such problems.[29] Complete loss of testicular testosterone production resulting in testosterone levels within the castrate range (95% decrease, to 15 ng/dL on average) with surgical or medical castration causes profound sexual dysfunction in men.[30][31] Combined marked suppression of testicular testosterone production resulting in testosterone levels of just above the castrate/female range (70 to 80% decrease, to 100 ng/dL on average) and marked androgen receptor antagonism with high-dosage cyproterone acetate monotherapy causes profound sexual dysfunction in men.[30][32] Treatment of men with medical castration and add-back of multiple dosages of testosterone to restore testosterone levels (to a range of about 200 to 900 ng/dL) showed that testosterone dose-dependently restored sexual desire and erectile function in men.[33]"

    Seriously, I do not understand why Sapolsky tries so hard to talk down the massive importance of testosterone in men's sexuality.
    Testosterone is absolutely necessary to have any sexual behavior in men. It is even more important than having a sexual partner, such as a woman, as men with high levels in testosterone don't need a partner to engage in sexual behavior.

    What would cause/amplify sexual behavior in men even more than testosterone?
    Good luck in finding that, because all scientists have failed to do that so far.

    August 16, 2019
  93. Dfd_Free_Speech said:

    1:30:33 The info about male testicle size is wrong:
    The testes of human males are not halfway in between but much, much closer to monogamous than to polygamous species.

    "In sum, the evidence from relative testis size and sperm midpiece size consistently indicates that men are not biologically adapted for promiscuous mating accompanied by sperm competition."


    August 16, 2019
  94. So sehe ich euch (Kanalinfo) said:

    AS it is normal to flee rapemob, satanists being murderers, Islamists, sadistic brutality by clans and hooligans, it is natural to have psychiatrists mentioned as criminels, rapemob, liers, scizophrenics, sadists in intent to robb, falsification and sadistic brutality, which is their tool to war as part of criminel organisations, which they abuse in all of rights and asxdenuers of holocaust which is that of criminalising the victims of sadistic clans and brutal mob in traditions, which are as outdated as is their science, which is a threat to animals also,as is use and abuse of animals and humanbeings to experiments, which are damaging their bodies in numbing down their resistence by poisoning medication to sadistic violence and brutality by mob in the intent to robb of their rights to defend, to exist and to critisised the uttermost evil of organisations, which are used to nothing but brutal violence and sadism and organised crimes by criminels, who are organised like islamists in primitivity of rapemob and use of science, which is nothing but brutal and sadistic violence by mob,including medicals and judges, teachers and polititians, who are organising robbery, betrayel and war, warpropaganda and terrorism, falsification of identities, truth and hindering of justice by traditions, which are as cruel and even more of cruel, than abuse of animals and humanbeings as punchingball and to torture them, testing brutality, sadism and violence by mob as if this prey had no right to defend itself and to flee this warcruel betrayel, terrorism and brutality,sadism and brutal injustice and primitivitism, which is this war in neglect to all of jurisdiction, which was already planned to hinder this intendet robbery and murder of rights and the existence in peace and which get's abused by judges, who themselves are part of criminel organisations, which will get them charged for organised robbery, falsification of truth, betrayel, crime and murder with medicals and police partaking in it, as organised in criminel organisations, which will have them punished by deathpenalty in hindering truth and justice and peace in violation of rights against brutality by mob and sadistic violence by mob of islamists and nazibrutals criminels in their racistic brutality and terror, which is nothing but feeling superior by organised harrassement and gangstalking violence in traditions, which are forbidden by law, for nobody can be forced to be a member of religious fanatics, terrorists and criminels, sadistic clans or even prostitution, which organise real prostitutes, rapists and criminels and sadist in the intent to harrasse and attack, like primitivs in uncivilised cults and cultures, as is islamism a part of, are used to, which will have this rape cultures, this sadistic clans being criminalised for organised crime in hate to justice and jurisdiction, which is that of peace, which those criminel clans and sadists, judges, members of police, partaking in it will have warned by deathpenalty, for being part of criminel organisations.

    August 31, 2019
  95. So sehe ich euch (Kanalinfo) said:

    And no, neither islamism, nor rapemob, nor war, nor brutal sadistic mob of gangstalkers, being judges, medicals and members of police there in involved and partaking in it, have to be tolerated.
    This is fact and this rapemob brutals are as they are nothing but robberers and liers and brutals working for psychiatry have to be tolerated in their organised falsification of identities, truth and abuse of animals and humanbeings as HOSTAGES to uttermost evil and cruel betrayel and hooliganism and even organised crimes by them, which are nothing but organised robbery, damage and hooliganism by members of political parties in organised terror and violence and sadistic brutality, which is long forbidden by laws, which get distorted by judges partaking in falsification of truth and identities and as members of criminel organisations in intendet damage and violation of rights against brutality by mob and sadistic violence, islamism and terrorism, sadistic violence and brutality by mob, torturers of animals also, which makes peace and justice impossible.

    August 31, 2019
  96. Richard Fredlund said:

    some interesting stuff… the guys politics are cringe.

    September 3, 2019
  97. Ryan Kenyon said:

    I could listen to him read cereal boxes and be fascinated.

    September 5, 2019
  98. Steven Görlich said:

    This series of lectures is just breathtaking. The clear structure, the recent information, so easy to follow, that I'm unable to stop watching.

    57:00 onwards is hilarious. "Made the people jump off buildings"…. "Half the people quit and went to business school" – nice to see that other fields also aren't considering economics as real science xD

    September 11, 2019
  99. Paul Walker said:

    I keep waiting for him to say, "And the answer is…. a Daily Double!"

    September 24, 2019
  100. B-ROCK said:

    1950s androgenized ,kinda odd after Roswell crash and the boost in tech.

    November 10, 2019

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