(1) Psychological disorders. Sexual ignorance, from childhood education are distorted sex as dirty, obscene; lack of correct understanding of sexual life; “masturbation and ejaculation is evil” thought. The woman is afraid of painful sexual intercourse; fear of damage to the vagina and internal organs and restrict the man’s pumping; the woman’s body is weak and restrict sexual life. After marriage, the couple does not have a good relationship, fear of pregnancy and various bad habits in sexual life. (2) Insufficient excitement of the sexual nerve center. Androgens such as “methyltestosterone” should be taken to supplement. (3) Insufficient penile sensuality and lack of pleasure. You can use “electromagnetic wave drug penetration sexual function treatment device” and take impotence medicine for treatment. (4) The vagina is too loose and not enough stimulation for the penis. This can be treated by changing the position of intercourse or using “advanced vaginal prosthesis masturbator”. (5) Endocrine system disorder, insufficient secretion of sex hormones. You should take androgenic hormone such as “methyltestosterone” to supplement. (6) Cold invasion of the penis. (7) Drug abuse. (8) Local foreskin is too long, itchy glans when rubbing in the vagina, foreskin inlay, pain, forced to interrupt sexual intercourse. (9) Severe spermatorrhea cannot effectively participate in the ejaculatory process, etc.