I think its based on the comfort level.
I mean, men are less reserved, but still, you wont catch me walking through walmart with my cock swinging free. I think its also based on the situation. My wife will go nude outdoors, and does so regularly, since we have a tall wooden privacy fence in the back yard, and a swimming pool, but she only went into the front yard nude once after losing a bet with me and her friends. It was dark, and no one was out, but still, it depends on the woman's ideals. its like asking a woman what is sex to them. Some women are unabashed, while others might be epic in the sack, but wont flash.