hey young man don't over do it mastubation really destroys you, your ability to think faster is reduced when u do it often,moreover it reduces your 'feelings' for real sex.THINK ABOUT IT.
Oh please gimme a break.
1. It's safe 100% (No STDs to worry about etc). medically speaking theres no proof that it's harmful.
2. It's pleasurable (sure beats having a lazy lover that just can't do u right)
3. You can do it alone, or with somelse (even of the same sex and no biggie)
3 extra solid reason to touch yourself. I can give u more if u want.