Cat mating question? very curiouse?

My female cat is in heat and there are many males that come to my window and hisses and growls at them I've allowed one it and she totally rejected him but one male cat in particular she doesn't like him on a normal day but right now that she's in heat she don't hiss at him she rolls around the dirt and he meows then grabs her by the neck and they to do there thing before I yank her from him...my question is why is it that she hates all th other male cats and she will allow this one to get her?? I mean the other cats are handsome too lol