you will not find a category about the attractiveness of female characters. Apparently it is fine to have an entire category attributed to men with muscles.
That's because a category featuring attractive women would be redundant, since most movies with women in them already feature attractive women.
Also there are categories about strong female leads but I see no such category for males.
That's because a category featuring strong male leads would be redundant, since most movies with male leads already feature strong male leads.
You might as well ask why there aren't categories called "color films" or "talkies".