It looks like he's turned toward the locker, and his legs and his dick are coming out his backside...

Arms can't bend backwards at that angle

Put your arms behind your back. Now extend them outward to, let's say, a position where your wrists could be tied together.

Congratulations, if you have no real biceps, your arm looks like that.

I know that, but now I can't unsee it.. rofl.

:) That was more for Alignn's comment.

Well, it's hard to say for sure, but it looks like the curve on the elbow indicating how bent the arm is, is too long to allow for a possible position.

There must be two guys in this picture. One at his locker and another on the bench. Maybe the other doesn't know what's going on.