For women at least, and it's very, very mild. Your heart rate still increases along with your breathing and you'll even find yourself sweating. You also know that you can have a guaranteed orgasm without getting pregnant or contracting an STI. But for boys, masturbating is very different to sex, and it's not because of that one obvious reason. When men ejaculate on their own, their body responds differently to it. They have a lower sperm count and it doesn't give them the added health benefits of what having sex gives. But there are other health benefits that 'come' with this act. It can lower the risk of diabetes, reduce back or leg pain, reduce the risk of a heart attack and it even makes your hair shinier. You're doing it now aren't you? All in the name of your health of course...