"Craft" is a common and normal way for young men to vent, but these three "crafts" should be avoided:
First, solve it too quickly.
It is so easy to form reflex ejaculation for a long time, and develop the Xi of quickly "handing over homework", which affects the harmony of X's life in the future.
Second, the "craftsmanship" is excessive.
The most common cause of excessive kidney deficiency in men, such as impotence, poor hardness, easy fatigue, and sensitivity to cold.
Third, use too much force.
It can easily lead to skin damage or frenulum breakage, and the pain of frenulum rupture will be remembered for a lifetime.