SexAtDawn
Sex At Dawn
I did not read the book I just read the summary. Here
Three Lessons:
- Agriculture marked the beginning of monogamy, and not in a good way.
 - Women want sex just as much, but are conditioned to play it down.
 - Our bodies have evolved to thrive in sexual competition.
 
Out Bodies have evolved to thrive in sexual competition
- A man's testicles are stored outside the body for optimum sperm temperature and conservation.
 - The shape of the penis is for high sperm precision.
 - The thrusting motion during sex might be a way to try and "pump out" other men's sperm.
 - Sperm has chemicals in it, that protects the first few drops from other men's sperm.
 - Men are taller than women, because women prefer their sexual partners to be taller.
 - Women moaning loudly might be a call to attract further men to try and fertilize them.
 - Women take longer to orgasm and can have sex longer to maximize potential partners for a successful impregnation.
 
Also look at Whysexisfun