It's only my opinion, that all depends on how much regard women have for their own selves. If a woman lives with men other than her own man in a "You can watch but don't You even dare to touch" way, it's ok. The rest are just whores to me. Men should respect their own selves even more. I know a joke about it... I'll try to translate from Polish.
Totally drunk husband comes back home late at night and his wife opens the door for him. Next day morning, he wakes up in his bed. Bedclothes are fresh, his wife with a cute smile brings him breakfast and gives him a kiss, then sits near him and keeps smiling. Husband totally shocked asks his wife: Wha... what the heck? Aren't You mad at me? Why You brought me breakfast after I came home such drunk? Wife answered: Oh honey... You probably don't remember. I was helping You strip and when I was unzipping Your throusers You yelled at me "get off me You fuckin' bitch! I have wife and children!"
Hope I didn't fuck up the translation and You got my point