I actually did a quick Google search after responding to another commenter and discovered that - number one it hasn't really been studied (because of course it hasn't since it has to do with women) - and number two, they acted like it's not that common.

But I'd be willing to bet that when they actually get around to studying it they'll discover most of us are like that. Even biologically it makes sense because we'd be looking for providers, not just a pretty face. So we'd need to be more discerning than men who just stick their dick in anything available.