One thing too is during times of war, more males are born then females. Since you mentioned evolution I thought that should be added since we are in a time of war. I also saw a link that woman are more likely to become prostitutes when the price becomes higher.

Personally, I think people should direct there energies in other directions rather than sex. I think sex is something that should be enjoyed, yes but there are other things one can focus on. For example, schooling.

sincerely,

stve