rofl!
That's not necessarily true, when a woman does that it's because she finds u a "nice guy", and "purely nice guys" don't sexually arouse them, they just make them feel comfortable, if there's a thing I've learned by being an teenager a-hole(which I was. Regretfully, but not that much) Is that women dig jerks more than nice-guys, but these relationships never last and are fated to rough endings, the trick is to find a balance, being nice when it's fitting, but being a jerk when it comes to sex related subjects and personality related subjects(u must have a strong personality, and u must be decided, hard on your choices and beliefs).
I roughly call that:
An slap for each kiss, an kiss for each slap philosophy.
Do that and you'll uncover the relationship heaven, and if u dare to do that to girls that already friendzoned you, don't worry, they'll start digging you the moment you show these colors, most importantly, don't take that as "being a sadistic jerk" nor take it as some sort of "revenge" be gentle, but brutal! I've never being really friendzoned when I did that, now-a-days I only do that when I really want the girl, which's something rare, to really want a girl, most of them are just selfish gold-diggers with little to no consideration for you, at least in my city things are dreadful when it comes to women...
PS: And being a jerk sexually related means being like a crazy pervert with aggressive approach(not rape, and not 5min less orgasm, that's just what will make u lose her forever)