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Lecture 11

Outline Lecture 11 Mating 1.odt

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Department
Psychology
Course
PSYC 3100
Professor
Pat Barclay
Semester
Winter

Description
Outline Lecture 11 Mating 1 A: Some basic predictions 1. What would an outside observer predict about human mating? 2. “Would you…” -men and women similar on going on a date -much more men than women say they would go back to apartment (70-8%) -same thing with gong to bed with the person 3. Basis of Predictions: – Differences in minimal parental investment: who has the bigger gamete? (sperm vs. Egg) – female carries offspring till birth (9 months), minimum is higher for females – Biased “Operational Sex Ratio” (this is different from sex ratio) – sex ratio: males:females – OSR: number of males:females who are able to reproduce at that time – sometimes females are not able, at some time there will be more males:females who can reproduce at that time – in some species, minimal parental investment is more for males (seahorses) 4. Predictions - Sex differences in body size and/or weaponry: males may have bigger bodies and weapon, on average human males are stronger and larger than females - Delayed maturity in males: pays to wait a little, build more muscle, social status, etc. Holding off and building up capital before the competition starts. In humans females begin puberty years earlier than guys do. – Sex differences in mortality & longevity: external causes: take bigger risks (physical and social) to attract mates; internal causes: short-term physiological versus despite long-term negative effects (e.g. physiological costs of testosterone) whether internal costs or external costs, men are taking bigger risks and dying more at every age - Sex differences in willingness to engage in sex: male reproductive success (RS) increases with each additional mate, whereas females do not gain as much from mating again; Males benefit more from multiple mates and from mating again soon than do females; Result: males in polygynous species are more willing to have sex; In every region, men desired more partners over the next 30 years than women did The Coolidge Effect: male refractory period decreases when a new female is introduced males more ready to have sex with a new female than with the same femaled B: Effective Polygyny (i.e. greater variance in male RS than in female RS) -for long term relationships, both sexes invest alot -sex differences in choosiness diminish for long term relationship; for one night stands and dates, women are more choosy than men are. -women have larger minimum investment, & so are more choosy for short-term relationships 5. Causes – Polygynous versus monogamous marriages: polygyny: 1 male multiple females polyandry: 1 female multiple males polygynandry: multiple females & males Polygynous Temne of Sierra Leone: male reproductive success increasing with the number of females married to male, he has more offspring with more females U.S. Mormons: more wives mean more reproductive success In many culture
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