The 30 to 50 came strait from Cosmopolitan magazine.

I read it some time ago and they based it on an average 3 boyfriends per year since sexual activity begins around 18 years old. Yes, I do admit that there may be some over generalization or simplification.
Yet the issue of sexual choice being female is highly document by many sociologists. As well in naturalist who see this fact repeatedly in other species of animals. In fact there are many books on this subject. I didn’t just make this up on this board.
http://www.cogsci.ecs.soton.ac.uk/cg.../newpsy?12.008
http://www.pupress.princeton.edu/titles/5817.html
http://human-nature.com/books/geary1.html
These selections are only a tip of the iceberg of studies.
Facts are facts, and it’s empirically obvious that it’s the female that gives the green light for sex not men. Men haven’t been buying sex for thousands of years for nothing. You don’t see many male prostitutes vying there trade servicing women.
The lack of emotional bonding is another thing I didn’t make up. Without getting to religious here, the bible is replete with this message, a message that has stood the test of time. It’s not just in the bible, it’s taught through out cultures and societies from western civilizations to the tribes of the amazons. In many of theses cultures this message is taught in females dominated cultures by the female matriarchs. Ask yourself girls if you don’t feel you could take back that sexual history. Don’t your girls sell your chastity when you meet a guy you really like and want to stick around? Isn’t hypocrisy to claim your past or sexual experience means nothing and yet is the 1st thing you try to conceal.
Rationalization is just another word for denial.