You've never seen a cute, petite, leather clad female beating up a big man on a Whedon show? Two really hot young femme girls in bed together?
I have, and I don't think he ever did that for sexual or pornographic intent.
It's a far too commonly recurring theme for it to be a coincidence. He has created four shows and gotten them on the air, each one has had multiple characters of the same type - Buffy, Faith, Cordelia, River, Echo etc.
The last season of Buffy had a hundred of them!