LMAO HELL YEAH ITS OK !!
1. It releives stress.
2. Decreases the number of horny people in the world.
3. Decreases number of teen pregnecys in the world.
4. Its a good work out.
5. Burns callories.
And for all you people that think its bad, go cut your wrist or puke or something. Because there is nothing wrong with doing it 95% of guys do it and im positive 95% of girls do it but there just to emmbarresed to admit it, theres nothing to be embarressed about every one has hormones.
So yes it is ok
Pain is only weekness leaving the body.