Muscle tissue vs fat tissue is the main difference between men's and women's legs. Hence, most of men's legs are thinner. Some women have very big thighs and would kill to have less fatty men's thighs.

So yes, I've had women that were a bit envious of my legs. But, I know better! Women's legs generally have a feminine shape while men's have a masculine shape. That muscle tissue men have is a giveaway IMO.