Can't really post this easily, so...
http://blog.okcupid.com/index.php/10-charts-about-sex/
Some of the correlations look funky, I think charts 1 and 9 look interesting.
Basically, women claim to have less trouble orgasming in the middle of their lives. And overall, women who exercise have less trouble.
In Chart 9, the price of college (IE private vs. public) seems to correlate to [claimed] sexual activity. The implication is that students at private colleges have more sex. This one seems...either totally true or totally false.