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Here's one more man who wouldn't give a damn if my girlfriend had been in a threesome before. Either MMF or MFF. Honestly. In fact, assuming she did it willfully, I'd admire her for taking responsibility for her own sexuality and for not just doing what the small-minded posters here would have her do.
What I haven't heard is WHY so many of these guys would have a problem the situation. What would bother you about the fact that your girl had a threesome in her past? Saying "every guy would feel that way," in addition to being false, isn't an explanation. Also, why would you assume that simply having been involved in a threesome makes her a "slut?" And what else is on your prohibited list? What if she'd had anal sex? What if she'd used sex toys or done a lot of role-playing? I have news for you guys: All these things are normal, healthy sexual behavior, whether you're made squeamish by them or not. This ain't like bestiality or "gangbanging," which actually are, by most human standards, deviant.
Women, rest assured that I'm not exceptional. There are plenty of guys out there who recognize that female sexuality is a great thing and who don't feel the need to dominate you or make you fit into their controlling little box, even if there aren't that many of us writing letters to Salon this afternoon.