sex\

Space Marines. That is all.
Chaos Space Marines, the horny versions of their loyalist counterparts.
Orks. Still not enuff dakka.
Eldar. No comment. But their helmets are funny.
Imperial Guard, complete with standard issue flashlight and GIANT STEEL BALLS
Sisters of Battle, who everyone knows are a lot of sex-deprived, child molesting pyromaniacs.
Tau, a specific Tau in particular.
Necrons. And his chest is a birdcage. I am hilarious.
Tyranids: Unyuufex.