I think it's gotta be more then the cock. He always dumps them where as a woman will dump a huge cock for some strange just like men from time to time. Seems like NO woman leaves him.. I'm of the belief that he is a complete slave to whatever woman is his conquest. The cock plays a huge part at this point but it's the way in which he must constantly fawn all over these chicks while he's on the hunt that hooks them for life. Then he gets bored and ignores them which is a huge asshole move if he has pursued the woman awhile.
if that's the case then I have to give him some respect.