How do you masturbate? is it healthy?

Near-universal: Techniques very tremendously. Most men grip their shaft and rub up and down. Most women rub their clitoris, often with something that vibrates. You'll know what to do and find out what works best for you. The activity often leads to orgasm in either sex. There are no adverse health consequences. A few men become addicted to erotica; we can treat this.