The blatant double standard in this thread is awesome.
Now granted, some of the posters here probably wouldn't think a FFM three-way would be "appropriate" for a committed relationship, in which case it's not at all hypocritical that they would think asking for a three-way is some sort of red flag. However, I wouldn't be surprised at all that some of them think that FFM three-way is something for both members of the couple to enjoy, whereas a MMF three-way requires some sort of compensation.
Anyway, to the OP: you might just not want a three-way, regardless of how your aversion to the idea came about. Yeah, a sexual relationship sometimes requires a little give and take, but a three-way goes beyond simple compromises, especially considering that you probably didn't go into the relationship expecting her to ever ask this of you. If you did, then you should've been more prepared for this and had this discussion with her from the start of the relationship. In general, however, there's no reason why anyone should HAVE to be open to introducing a third into their committed relationship.
Ok, so yes, though it's not really so relevant in this case, there's probably a culturally-imposed attitude on you that if a dick was to go into your territory (you girlfriend's snatch), that somehow emasculates you. And there's no equivalent for when the genders are reversed. But again, that doesn't matter; for better or for worse, our sexual attitudes are shaped by traditional institutions and expectations, even if sometimes they might be archaic or nonsensical. I know mine sexual attitudes are, even in ways I wish they weren't.
But again, all of the above doesn't really matter (unless it matters to you personally, for whatever reason). You don't have to be open to a three-way, and you don't have to be okay with it. Just realize that it might cost you the relationship if this is a dealbreaker for her.
With all of that said, I'll add this: if you had any idea that she had three-ways with her previous boyfriends, you should have discussed your aversion to them very early on. But if she never told you that she has and wants three-ways in her relationships until she started demanding them, then it's completely on her for being irresponsible in not telling you about this.
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