Speculations on the origins of human sexuality ch

SPECULATIONS ON THE ORIGINS OF HUMAN SEXUAL BEHAVIOR,[object Object],Leanna Wolfe, Ph.D.,[object Object],Institute for Advanced Study of Human Sexuality,[object Object],February 9, 2011,[object Object]

When the gods gave people sex, they gave us a wonderful thing. Sex is food: just as people cannot survive without eating, hunger for sex can cause people to die,[object Object],Nisa,[object Object], The Story of Kung Woman,[object Object]

What’s Unique About Humans?,[object Object],Hidden Ovulation,[object Object],Extended Childhoods,[object Object],Human Infants are the least mature apes at birth,[object Object],Year Round Female Receptivity ,[object Object],Irrelevant of ovulation,[object Object],Bonding,[object Object],Serial Pair bonding,[object Object],Polygamy/Monogamy,[object Object],Based on economic, social and cultural factors,[object Object]

Just So Stories…,[object Object],Adam and Eve,[object Object],Mitochondrial Eve,[object Object],Early Emergence of Male Provisioning Female and her Infants,[object Object],Owen Lovejoy,[object Object],Hidden Ovulation emerged to enable Pair Bonding,[object Object],Helen Fisher,[object Object]

Mitochondrial Eve,[object Object],Newsweek’s most popular cover ever,[object Object],The discovery of a relatively recent emergence of Homo sapiens (less than 200,000 years ago) was lost at the thought of there having been a Real Eve…,[object Object]

Extended Childhoods,[object Object],[object Object], Birth,[object Object],[object Object], Provisioning,[object Object],[object Object], Important for Survival,[object Object],Advent of the Nuclear Family???,[object Object],Dikika Child,[object Object],3.3 mya,[object Object]

Human-Ape Origins,[object Object]

Distribution of Apes,[object Object]

The Sex Contract,[object Object],Owen Lovejoy, Male Paleoanthropologist,[object Object],A Maasai Tribe Shares Meat,[object Object],Immature young caused females and males to form long term pair bonds in order to facilitate care for the young,[object Object],Ethnographic data from foraging societies establishes that a woman’s offspring will be well-fed simply if she is part of a tribe in which there is at least one good hunter.,[object Object]

A Sex for Meat Exchange?,[object Object],Certainly, but no evidence that it took the form of monogamous pair bonds,[object Object],Successful male hunters might have exchanged their bounties with multiple females, ultimately accessing sexual variety,[object Object],Females in the quest for as much meat as possible might have gladly exchanged sex with multiple male hunters,[object Object]

Bonobo Estrus Displays,[object Object],Bonobo Estrus Display Attracts Attention!,[object Object],Bonobo Full Estrus Display,[object Object]

Human Ovulation Displays…,[object Object],Ovulation Test Kit,[object Object],Measures rise of Luteinizing Hormone, signally impending ovulation,[object Object],Female Showing Lots of Skin,[object Object],(possibly ovulating),[object Object]

Explanations for Hidden Ovulation ,[object Object],Helen Fisher,[object Object],Anthropologist,[object Object],Sarah BlafferHrdy,[object Object],Anthropologist,[object Object],[object Object]

Female Independence,[object Object]

Testicle SizeAs an Indicator of Non-monogamy,[object Object],With their relatively large testicles male chimpanzees are well-equipped for intrauterine sperm wars ,[object Object],Humans also have relatively large testicles…,[object Object]

Y-Chromosome Distribution,[object Object],[object Object]

Reveals widespread long-lasting polygyny among human populations,[object Object]

Sperm Competition,[object Object],Three unique kinds of sperm (blocker, fighter and egg penetrator) were distributed differently depending on the context of lovemaking.,[object Object],Only Egg Penetrator Sperm could cause a pregnancy,[object Object],Sperm from different males might compete,[object Object]

Reproductive Strategies,[object Object],Male (re: MPI),[object Object],Cad (low investment),[object Object],Lad/Pair Bonded Mate (high investment),[object Object],Female (discerning Mate Value),[object Object],Monogamous Mate,[object Object],Sexy Son Hypothesis,[object Object],Partible Paternity,[object Object],Extended Family/Tribe/Village/Community,[object Object]

Sexy Son Hypothesis,[object Object],Females seek testosteronated hunks near ovulation while long term bonding is sought with fatherly resource providers.,[object Object],David Buss,,[object Object],Evolutionary Psychologist,[object Object]

Humans are by Nature Hypersexual and Promiscuous,[object Object],S.E. Ex – Socio ,[object Object],Erotic Exchange,[object Object],Primeval societies engaged in communal parenting, group sex and were oblivious to paternity,[object Object],Christopher Ryan,[object Object],Research Psychologist,[object Object]

How Males Care About Paternity,[object Object],Dogon Menstrual Huts,[object Object],Contemporary DNA Testing,[object Object],Chastity Belts,[object Object],Female Genital Mutilations (FGM),[object Object],Post Nuptial Virginity Tests,[object Object]

Why Males Care…,[object Object],[object Object]

Assured that Just Their Genes Go Into the Future

Speculations on the origins of human sexuality ch

Speculations on the origins of human sexuality ch

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Speculations on the origins of human sexuality ch