Merkinball
Deity
They always dressed River in weird dresses and boots, plus she has a very plain face. You never even got a good look at the body because of the clothes. Meh. She never did it for me, I would take any woman on that show over her. Except any old/fat ones...you get the idea.
Kaylee at least had a clothes that accented her body occasionally (even if covered up by overalls). Plus a very pretty face. And how is a greasy mechanic chick who likes to screw next to the ship's engine not hot???
Dude.
River took on the Reavers.
By herself
Nothing gets hotter than that. Especially in those dresses...