because it just looks odd to watch a male move gracefully.
Assasin Creed anyone?
Thief, Sleeping Dogs..
More bulky? Male, because being bulky is a male sort of thing
well.. I've played with one girl who played fat orcish warrior in NWN, so my illusions are away on that either
Just for reminding that it can feel "general" but in the end it doesn't really matter at all. Same as shield carrying paladin Aribeth hasn't looked strange.