The Second Amendment is a lot like the First Amendment. You should be able to practice it however to want, to whatever extent you want, without legal repercussions as long as you're not causing harm. Doesn't mean you're not an asshole, though.
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I do care about monogamy - but not as a concept. What gives monogamy value is the outspoken decision between two people to be faithful, the promise, not the principle of two people traditionally being bound by social norms. Thus, if we got involved the boundaries of our relationship would be cleared out early on. For example, I wouldn't care so much about sex, but I would be deeply hurt if he would get emotionally involved with another girl. Holding hands would be worse than sleeping around.
Further on, since I know the guy, I seriously doubt I have rewarded him in any way. He is most likely as high and mighty as a fresh pile of dog poo.
A more interesting ethical problem would therefore be whether it was really worth it to put a friend of mine in such a great moral dilemma.