I'm trying to think of the justification for that one....Maybe its that there probably are a few specialties not open to women, such as Spec War and Nuke, that aren't open to men. Maybe fewer slots for those who want to join the Corps? I don't know. I suppose its probably something like that. If that's the reason, there's some logic to it.
What bugged me were things like Ac Boards. Youngster year, I lost a roommate who had a 1.76 for the semester. A female classmate, same company, with both a lower QPR and a lower CQPR, was retained. And she was one of the worst in terms of military performance too. But they just wanted to keep the women more than the guys.
I know of a woman there who was unsat pretty much the entire semester of every year she was there, except for at the very end, when she managed to pull off a 2.00001 or something like that. They went above and beyond to retain her, whereas they'd let a similarly-talented man sink or swim on his own.
Another woman in my company was on the sick, lame, and lazy squad for the entirety of plebe summer. First it was sinusitis, then it was a blister, then it was sinusitis again---every time she was due to get off the sick, lame, and lazy list, something else would crop up. A miracle! She was retained, of course. It was never even a question.
It's really no secret to those of us who spent some time as a student there: there is a definite bias for retaining women at all costs. And there are women who definitely deserve to be there, too. But it's foolish to pretend there's an equal playing field . . .