The human wang is a weirdly sensitive thing. I imagine sometimes it's just easier for the mope to whack himself off. Throw in the various ED meds that will produce boners but sometimes make achieving carnal satisfaction a little unpredictable, it can get a little dicey.

You're taking a normal bodily function and directing it. It's a recipe for disaster. When it's all said and done a dude knows what will get him there. That said, I can't understand why said dude can't pass off the rock to the whore when he's a few strokes from there.

Or they're all fags.