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Hey Alex, you make a bit of a deal about your education in support of your moralistic and, I'd suspect, deeply insecure views about women who have sex without you (sluts, right?), but I would have thought most grad students would realise that "Chasing Amy" is not a case study - it's a fictional film.
You're entitled to your own beliefs and you are entitled to chose a partner according to your own standards, but when you starting judging others, then you'll attract judgment down on yourself.
By the way, I'm not one of the sisters ganging up on you for ideological reasons. I happen to be a guy and I agree the LW's boyfriend is being a damn fool. As far as I see it, what my partner does, or has done, with her body is only my business if she wants it to be.