also a word on avatar:
i left out neyteri, because as cooke pointed out i also thought it was an exception, but the more i look at the navi, i see theres not a lot to differentiate the male/female forms.
males are slightly thicker, mostly in the upper torso but otherwise both are the same height, have the same long hair, same skinny waist, girl has no tits.
cameron got around having to butch up the girl by making his own androgynous species