Why are you curious about this? Male dancers are people, and some people do some things while other people do other things. The demands of dance can be great, but they are more physical demands rather than cosmetic demands.
The sleek look of thre male dancer's legs might be due to the fact that they most often wear tights. On some black-and-white pictures you may not be able to notice the tights, and think the uniform appearance happens to be cosemtically altered legs. This is a "trick" of the camera, not the male dancer.
I hope this gives you some insight. BalletMaster[/i]