There is no scientific evidence that masturbation causes the penis to become smaller. When you are concerned that masturbation will affect your penis size, you can stop masturbating. If you are not satisfied with the size of your penis, you can consider surgery to improve it. 1. Stop masturbation: Since you are worried that masturbation will cause your penis to become smaller, you should avoid frequent masturbation. Daily less exposure to pornographic books, movies and TV movies, etc., to avoid arousing sexual desire. More exercise, through exercise to express the excess energy, improve the mood. 2. Surgery: When the penis is too small in adulthood and you are not satisfied with it, you can consider surgery to improve it. At present, there are surgical programs such as penile lengthening, penile prosthesis placement, penile thickening surgery and penile reconstructive surgery for small penis in clinic, so you can choose according to your own needs. Male friends do not understand the harm of masturbation, or feel that the penis is too small and dissatisfied, it is recommended to go to the regular hospital in time.