What are the most unsafe sexual behaviors?

Some sexual behaviors are very unsafe, so which behaviors are the most unsafe? Please see the introduction below. The so-called safe sex is a kind of sexual behavior that can not only get sexual pleasure, but also avoid sexual risks. There are three main risks of sexual behavior: physical injury, psychological injury and unintended pregnancy. Physical harm means that sexual behavior will harm the body. Modern science has proved that sexual intercourse can promote the production of dopamine in the body and activate the "endorphin" of cell endocrine; Even massage can improve the level of serotonin in the body. These all have certain effects of relieving pain, relaxing body and mind and improving immunity. But improper sexual behavior can also damage your health. Overwork, drunkenness, menstruation, pregnancy, puerperium and sexual behavior during illness will all damage your health. And when one party is sick, there is also a chance to infect the other party; When in a bad mood, the whole body will be in a sub-health state, and the violent impact of sexual behavior may aggravate this sub-health state. At this time, the weaker internal organs in the body may get sick.