There is no authoritative data to show that it is normal for a 30-year-old man to have intercourse once every few days. The frequency of male coitus should be combined with their own situation, usually, 30-year-old men can be about 4 days once coitus, but due to individual differences, the above data is for reference only, should be adjusted accordingly with their own situation. The coitus can strengthen the emotional bond between partners, cultivate tacit understanding with partners, and enhance physical fitness. Due to individual differences, if the sexual function is more vigorous, stronger sexual desire or higher physical quality, the frequency of coitus will be more frequent. On the contrary, the frequency of coitus is lower. But if the frequency of coitus is more frequent, there may be genitourinary tract infections, such as glans, urethritis, prostatitis and so on. In serious cases, it may also lead to semen not liquefied, seminal vesicles easily contraction guide and other phenomena, affecting the fertility function, in addition, it will also lead to a decline in the level of testosterone, morning erection reduction, decreased libido and other symptoms. Therefore, the specific frequency of coitus should consider their own situation, it is recommended that the 30-year-old man appropriate coitus, avoid excessive, so as not to affect the health of the body.