The big one is the lack of clothing for the adult costumes. Like the female adult costumes, notice a theme in the male adult costumes? No shirts, buff guys with pecks and abs, tight pants (if there even are pants), a chisled jaw, and a very serious look. Why do the adult costumes have to be so revealing?
Yes it might be "sexy" but why does sexy have to meant scantily clad? I mean, if you want to wear these costumes then great! Go for it! But they shouldn't be the only choices for us and from personal experience, these "sexy" costumes seem to be the only thing you can find.
Also why are all the models have large chest muscles, big arms, and abs; it's incredibly unrealistic for the average guy and just holds true the "male standard" of good looking.