I have read multiple articles and websites about masturbation seeking an answer regarding whether or not it is harmful, and if so in what ways. Unfortunately, some said it's harmless some harmful and listed several things such as hair loss, weakened eye site etc...I would like to know from a medical and professional point of view, which is it? Is masturbation harmful? If so how? What is a good masturbation frequency? I am 22 years old, never been sexually active yet, I weight 155 lbs and I am 5'9''.