PSYC 3100 Lecture Notes - Lecture 11: Coolidge Effect, Polygynandry, Parental Investment

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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
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Document Summary

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: basis of predictions, predictions female carries offspring till birth (9 months), minimum is higher for females. Differences in minimal parental investment: who has the bigger gamete? (sperm vs. Biased operational sex ratio (this is different from sex ratio) 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 willingness to engage in sex: male reproductive success (rs) increases with each additional mate, whereas females do not gain as much from mating again;

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