Come on, you know you’ve tried it. If you have a penis, a mouth, 15 spare minutes, and even an iota of curiosity, you’ve tried to see just how close you can get your face to that pesky little pecker you carry around in your pants. That’s OK, man has been trying to get that thing into his mouth since the dawn of time. Unfortunately, most of us can’t do it.
Source: How to Suck Your Own Dick