As a Christian, the subject of masturbation was very controversial to me. It felt awesome (of course it did), but wasn't it wrong? Didn't it hurt my body? At the very least, wasn't it a sin? No. It is not a sin, and it does not hurt your body. The fact that it is not even mentioned in the Bible (and EVERY sexual immorality is) shows that it was such a normal thing to do, that it wasn't even worth mentioning. In fact, it is healthy. It helps get rid of sexual tension, so you don't do things you will regret. Even if you aren't a Christian, know that you can masturbate in good conscious, knowing it is a normal and very natural thing to do (I mean, you can't tickle yourself, so why does masturbation work?). So, go ahead and enjoy yourself and your body.