If you see a guys leg and a girls leg with hair and smooth, without knowing who is who, would you be able to make out immediately. Lets say we cannot see above the upper thighs.
Most Helpful Girl
A man's legs tend to be a little bulkier than a woman's legs. A woman's legs tend to be a little curvier at the hip, more narrow/delicate at the ankle. In SOME cases a woman's legs resemble those of a young boy (or vice versa) because they share a thin, lanky build.1