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I've never really felt that monogamy was natural. I think the number of people that cheat on their spouses shows that humans have urges for variety. Do you think it's wrong to trade partners? A lot of couples get into this and don't look at it as cheating since they mutually agree to it. Could an occasional romp in the sack with a different person make a relationship stronger and keep people more faithful since they get some "fresh" pussy/cock without having to lie about it?