Sexy

What does it for you: the glorious smile? the intense eyes? the curve of the hips? an impressive bulge? biceps? chest? thighs?

For me it's a combination deal and the greatest turn-on is the accidental sighting of something naughty: something I'm not supposed to see! Full frontal nudity  viewed in the showers or steam room is definitely enticing but  buttocks glimpsed as a guy tugs up his jockeys is the real turn-on.

Semi nude is much more sexy than blatant nakedness in my book.