Well, honestly, gals are wired a little differently than men in this regard. I have used internet dating sites before, and I even got a little turned off if the guy had, as his main picture, a picture of him that was shirtless. It just seemed like too much too fast. I liked to see a handsome man with a nice body, doing something that looked interesting or fun or with an expression on his face that made me want to know more.
Now, this is a fitness site, so it is a little different. I like to see the men in something that shows off their hard work, like in a pair of board shorts, or whatever.
Seeing the full monty right off the bat is kind of fun, in a very outrageous sort of way, but not needed.