No, I find it hard to believe that someone would dress and act feminine and then proclaim they are in fact 100% pure masculine. Besides Hiro really never puts up much resistance. It's clear she loves the D.
That is what makes no sense. Be true to yourself.
It makes far less sense for you to make a bunch of assumptions of that nature in a game where androgyny is normal. Hiro's not "acting feminine", he's acting according to how he believes a hero should act and dresses in accordance with trends in the land where he's from. Even when he loses his dignity he doesn't act feminine, he acts
slutty. Urka isn't "acting masculine" either just because she likes slamming butts. Even Trudy has a firm grasp of himself as a man and his tastes and hapless nature don't invalidate those.
He's always acting true to himself whether he maintains his dignity or becomes a trashy hoebag; you're the one trying to shove him in a box.
edit: if your response to "the problem is with your perceptions, not the story or the character" is "you're blocked" then you shouldn't be surprised that you don't understand things that don't conform perfectly to your perceptions and judgments.