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Alex, congratulations for reading Foucault and Simone de Beauvoir. But for a grad student, you haven't learned to make a very coherent argument. 1) Sex is irrational and LW should understand her BF's insecurity or 2) BF is rational, reasonable, and morally justified in rejecting his girlfriend because of her past. Which is it? Or will you tell me it's both? Come on dear grad student, do what you all do best, reconcile the tension with your elegant prose clarity of thought.
I don't know if I'm a third-wave feminist or whatever. But this BF sounds like a snively wimp. Not because he doesn't like the idea of his girlfriend in a threesome. Because he's lorded it over LW for 6 months. Sure he's entitled to his emotions. But he needs to sort them out: does it mean the relationship is over? Does it mean he needs to make peace with it? Or does it mean he now has the right to be passive aggressive and make her feel like crap until he's unloaded all his anger? Apparently, if LW's account is accurate, he picked option three. Snively wimp. Alex by obsessing over the threesome thing you're missing the point of the letter. But that's probably intentional; what you really want to talk about is sex and double-standards. You want to bait people and use spiffy phrases like "misdirected feminist anger." Ok, fine, if that's your thing.
And for the record, you don't sound like a dinosaur. You sound like someone who spends a lot of time and energy noticing that the people around him are unworthy.