You can injure yourself trying to suck your own penis.
A lot of guys want to be able to give themselves oral pleasure – to stimulate their own penis with their mouth. Unfortunately, only a small percentage are able to do this, either because their penis is very large or because they're unusually limber. But a lot of people have injured themselves trying – we heard from one guy who once spent a couple of weeks in the hospital for a spinal injury he got while trying to do this. So, never put unusual strain on your back trying to reach your penis with your mouth. It's not worth the risk!
