C2V wrote:
As for guys I've found this is one of two things much of the time - A) an ego thing - they see a gay woman as a challenge, and think so much of their own sex appeal that they can be the one to "turn" her when no other man is mighty enough to do so, and turn her into a conquest. Or B) They find lesbians so hot from porn and so on that they'd jump (no pun intended) at the opportunity to sleep with one and fulfill those fantasies. Either way - douchebags.
Guys who fall for lesbians (I assume that we are talking about situations in which the guy knows that the girl is lesbian) can also be just unhappily in love. They don't have to be douchebags. It is hard to control who you fall in love with.
And if the guy doesn't even know that the girl is lesbian, there is no reason to assume he is a douchebag.