Have you noticed that some guys are more interested in sleeping with other people's girlfriends or wives. They enjoy it. They may have their partners, but may be more interested in sleeping with other people's girlfriends. Am not even talking of single ladies. it's like if these guys hear that a lady is in a relationship, it's like it sounds sweeter for them to sleep with. If you bring a girl, they may not woo her, but if you woo the girl and win her, then their chase to sleep with the girl may begin... I may not be perfectly correct, but some guys may be so.