Well I must admit I never have been worried about breaking this part of my anatomy before, but evidently it can be broken!
http://news.menshealth.com/never-have-affair/2011/10/05/

It happened to me about 2 years ago, seriously.  She was riding me like seabiscut, CG, and then we heard a pop as we both look down there and see my pecker bent like a dog-leg.  No pain but shocked the hell out of both of us.  She was worried as hell, I just wanted to finish.  I popped it back in place and she finish me off with a BJ.  I can still feel a knuckle there.

It happened to me about 2 years ago, seriously.  She was riding me like seabiscut, CG, and then we heard a pop as we both look down there and see my pecker bent like a dog-leg.  No pain but shocked the hell out of both of us.  She was worried as hell, I just wanted to finish.  I popped it back in place and she finish me off with a BJ.  I can still feel a knuckle there.