Masturbation may affect the development of the penis for teenagers, but for adults, the penis is already well developed, so it will not affect the development of the penis. 1. Adolescents: after puberty, the development of secondary sexual characteristics begins, if they receive incorrect sexual knowledge, and excessive masturbation or special masturbation methods, it will cause damage to the corpus cavernosum of the penis, causing scarring of the corpus cavernosum as well as fibrosis, which affects the development of the penis, resulting in a short, curved and other abnormalities of the penis. 2. Adults: For adults after the age of 18~20 years old, generally at this time with the end of puberty, the penis stops developing, so normal masturbation will not affect the development of the penis, but inappropriate masturbation or excessive masturbation may lead to damage to the corpus cavernosum of the penis, which leads to erectile dysfunction and other sexual function abnormalities.