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This is not about double standards. The LW is not dating 'society' or 'all men'. She is dating one male individual. So all of this nonsensical talk about 'men this' and 'women that' is a waste of time.
Going back to my last letter, this male seems to be uncomfortable with threesomes. That is fine, the line has to be drawn somewhere, and its unfair to say that he should be 'sexually liberated' enough to be able to accept a past that includes threesomes, or fivesomes, or gangbangs.
The REAL problem is that this appears to be a deal-breaker for him, and instead of dumping her, he's belittling and hurting her until she can't take it anymore and finally does the deed for him. THAT is the real indictment of the boyfriend, nevermind his supposedly unenlightened attitudes about sex, and THAT is why she should DTMFA.