It depends on how hot the woman is.
Best answer so far...^
Man has woman friend that is a 350 pound cow, absolutely no physical attraction at all. They are "just friends" and will always remain just friends.
Man has woman friend that is a 115 pound, screaming hot, Barbie doll, and there is NO WAY he is EVER going to be able to be JUST FRIENDS. He is going to DESIRE her for more every minute he's with her.
Now reverse the man and the woman in the examples and the same will hold true, and the only people that will deny it are either homo, sexually impotent or liars.