What does hand mean?

Rely on your own ability to solve sexual satisfaction and vent sexual energy, meet your own requirements for sex, and get pleasure and comfort from sex. Therefore, masturbation is a normal physiological phenomenon, and human masturbation is common. Commonly known as masturbation, masturbation, masturbation and so on are also used from time to time, and are mostly used to describe men. The name "masturbation" is widely circulated, but because "obscenity" is a derogatory term in Chinese, it is not suitable to refer to a sexual act, so the name "masturbation" should be eliminated and the scientific term should be masturbation.