Which is my sentiments to sex. I don't mind playing with other so long as the other person is around with me, but one-on-one is usually an intimate thing.
Volls: I agree with you. It IS like an overglorified fuckbuddy. I think open relationships are equivalent to being able to cheat, but with permission, so to speak.
This is quite a different topic from smoking and with children around.
Bringing another person in bed with you and your significant other is commiting relationship suicide.