27 JUL 2011 by ideonexus
Morning Sickness as an Evolutionary Strategy
In fact, some evolutionary biologists believe this is why morning sickness still persists in human pregnancies. Morning sickness, which can last the entire day (and, for some women, the entire pregnancy), makes a woman stick to a bland, boring diet—if she eats much at all. This avoidance strategy would have kept our maternal ancestors away from the natural toxins in exotic or spoiled foods in the wild, unregulated menu of the Pleistocene diet. The accompanying fatigue would keep women from en... 1 
notes
notesThe nausea encourages women to pursue a bland diet.
03 MAY 2011 by ideonexus
If Humans were Like Sparrows
It is my contention that man is just like an ibis or a swallow or a sparrow in several key respects. He lives in large colonies. Males compete with one another for places in a pecking order. Most males are monogamous. Polygamy is prevented by wives who resent sharing their husbands lest they also share his contributions to child rearing. Even though they could bring up the children unaided, the husband's paycheck is invaluable. But the ban on polygamous marriage does not prevent the males fro...
1 The sexual habit differences and similarities.
03 MAY 2011 by ideonexus
Orgasms and Sperm Retention
t. Baker and Bellis discovered that the amount of sperm that is retained in a woman's vagina after sex varies according to whether she had an orgasm and when. It also depends on how long it was since she last had sex: The longer the period, the more sperm stays in, unless she has what the scientists call "a noncopulatory orgasm" in between.
So far none of this contained great surprises; these facts were unknown before Baker and Bellis did their work (which consisted of samples collected by ... 1 notes
notesWomen retain more sperm when they have an orgasm, but they are also more likely to be unfaithful when most fertile.
03 MAY 2011 by ideonexus
The Harems of Ancient Cultures
But when she examined the record of history, Betzig was stunned. Her simplistic prediction that power is used for sexual success was confirmed again and again. Only in the past few centuries in the West has it failed. Not only that, in most polygamous societies there were elaborate social mechanisms to ensure that a powerful polygamist left a polygamous heir.
The six independent "civilizations" of early history—BabyIon, Egypt, India, China, Aztec Mexico, and Inca Peru—were remarkable less f... 1 notes
notesA strong argument for power influencing access to reproduction.
03 MAY 2011 by ideonexus
Four Rules of Mating and Paring Strategy
Let us erect the four commandments of mating system theory. First, if females do better by choosing monogamous and faithful males, monogamy will result—unless, second, men can coerce them. Third, if females do no worse by choosing already-mated males, polygamy will result—unless fourth already-mated females can prevent their males fro monogamy will result. The surprising conclusion of game theory is therefore that males, despite their active role in seduction, may be largely passive spectator... 1 notes
notesVarious environmental influences that determine polygamy vs monogamy, etc.
03 MAY 2011 by ideonexus
Why Women Store Fat in their Hips and Breasts
Low was looking to explain why young women have fat on their breasts and buttocks more than on other parts of their bodies. The reason this requires explaining is that young women are different from other human beings in this respect. Older women, young girls, and men of all ages gain fat on their torsos and limbs much more evenly. If a woman of twenty or so gains weight, it largely takes the form of fat on the breasts and buttocks; her waist can remain remarkably narrow.
So much is undispu...
1 Young women deceive men about their sexual fitness with fat to make their hips look wider and their breasts larger.
03 MAY 2011 by ideonexus
Sex as a Survival Strategy
In 1966, George Williams exposed the logical flaw at the heart of the textbook explanation of sex. He showed how it required animals to ignore short-term self-interest in order to "further the survival and evolution of their species, a form of self restraint that could have evolved only under very peculiar circumstances. He was very unsure what to put in its place. But he noticed that sex and dispersal often seem to be linked. Thus, grass grows asexual runners to propagate locally but commits... 1 notes
notesMany species that are asexual become sexual when it is time to disperse over large distances.
