Dr. Manhattan

A fictional superhero from Alan Moore's comic Watchmen who is completely blue. He is uneffected by natural laws such as gravity, and has blue man junk with which he has banged many women such as the Silk Spectre ( a fellow crime fighter). He also prefers to go around stark naked.

If you really need an example, go to a Borders or something and ask for a worthwhile comic. (Apparently I have to write "Dr. Manhattan" for this to work. So here)