Evolutionary psychologists tell us that women (and I’m talking cavewomen here) were originally monogamous out of necessity. Females have a limited number of eggs, so their time and resources had to be devoted any children they managed to have in order to, you know, continue the human race. Therefore, they needed to be choosy about procreation partners. Men, on the other hand, have an unlimited supply of sperm, so they want to spread their seed as much as possible to pass their genes on to many members of the next generation.
