Hi, Thanks for posting in HCM. I understand your concern. Masturbation is the sexual stimulation of one s own genitals for sexual arousal or sexual pleasure, usually to the point of orgasm. Masturbation is a medically healthy and psychologically normal habit. It is considered a normal and healthy part of sexual enjoyment. Doing it regularly is not known to have any adverse effect on health such as hormonal imbalance, causing weakness, decreasing sexual ability or performance and affecting fertility. However, it needs to be spaced properly and performed in a clean environment. You can educate your brother regarding it and ask him to do it in private. Hope the information provided would be helpful. All the best.