I've noticed that most women I've been around who I'd hook up with have boyfriends. They may not be happy and on the prowl for someone new, but VERY rarely will you come across one who isn't atleast fvcking some guy. If they get lonely enough they'll just go to a club/bar and let a guy pick them up. No real effort has to be put into this, as we all know, just look pretty and you'll get laid. I think the best thing would be not to think about it, just approach any woman, especially if you don't know whether or not she's seeing someone. I made the mistake of getting upset when I was being pursued by a girl who I found out later had a bf. I should've just fvcked her, it's what she wanted after all right?