When my girlfriend went to college in the USA for her master's. She cheated on me in the first week but after talking it out we agreed that she could fuck whoever as long as she told me that she was going to do it.
Once a week my wife and I like to go to a hotel and play friend roulette. She gets blindfolded and she sucks one of my friends dicks and if she guesses who it is she gets to fuck them.And if she can't she only gets my little dicklet