Because AGPs really are very conventionally masculine in personality and interests, I think. Stuff like the military naturally attracts them.

That's what makes them AGP in the first place, apparently: they have an erotic-humiliation fetish, and, since they totally buy into gender-roles-- men are superior, women are inferior-- what could be more humiliating (thus hawt) for them than... 'feminization'? But this wouldn't work unless they actually knew they were (and identified as) traditionally-defined men, would it? Because womanhood isn't humiliating for women in their eyes; we have no superior status to lose, after all... there's no place lower for us to go than where we already are.

It's like a billionaire CEO dude paying for a dominatrix to call him a little worm. The only reason he gets a thrill out of it... is that he knows perfectly well he's actually not.