Men should pay attention to local hygiene, pay attention to contraception, and maintain a fixed sexual partner after the first intercourse. 1. Pay attention to local hygiene: men should wash their private parts after the first time, so as not to breed bacteria, causing reproductive system infections, such as urethritis, prostatitis and so on. 2. Pay attention to contraception: If you don’t have a birth control plan, you should take reasonable contraceptive measures, such as the use of condoms. 3. Maintain a fixed sexual partner: you should be clean, maintain a fixed sexual partner, avoid multiple sexual partners, avoid high-risk sexual behavior, so as not to increase the chances of infection of sexually transmitted diseases, such as condyloma acuminatum, syphilis, AIDS and so on. Normally, we should have a restrained coitus, avoid too frequent, so as not to affect the sexual function, but also increase the incidence of reproductive system diseases.