My friend said that I had quite a lot of visits to my website, almost as many as all the doctors in our hospital. I did not pay attention to this matter, I asked why this is so? I think the reason may be because the material life is rich, people pay more attention to health, especially the health of sexual life, at least this is an important reason. As a medical doctor for many years, especially in male science for many years, I think it is necessary to introduce to friends some of the most simple, the most basic knowledge of sex life to prevent disease, as long as you do as I say, at least you can prevent the majority of sexually transmitted diseases. Human infectious diseases, through the sexual transmission of the way, is the most dangerous, the most direct, the easiest way up, because most people have to have this contact, and this contact with the disease is also the most dangerous diseases, such as AIDS, hepatitis, syphilis, etc.. The channels through which the human body can communicate with the outside world are the digestive tract – through the oral cavity, the respiratory tract – through the nasal cavity and the genital tract – the genitals. The prevention of diseases transmitted through the oral or digestive tract and respiratory tract is readily available, but the prevention of diseases transmitted through the genital tract is not well understood. First of all, pay attention to frequent washing, normal male or female, to ensure that two to three days to wash the external genitalia or vulva, because the normal external genitalia have some normal bacterial growth, which is not a disease, but if the number of bacteria, the skin’s ability to resist disease will be reduced, but also cause disease. If you find that the external genitalia such as foreskin, labia have redness, odor or itching, you should wash immediately, preferably with a 1:5000 solution of potassium permanganate (solution is pink, not too thick). The second is that before intercourse, both men and women should have a cleaning, just use ordinary soap or soap can remove most of the bacteria on the surface of the skin, can avoid the spread of most bacteria on the surface of the skin. Although condoms can prevent the spread of some STDs, but some STDs such as pubic lice, warts condoms can not prevent. If the examination reveals that the genital surface is red, swollen, broken, odorous, or feels itchy, painful and other discomfort, it is possible that there is a disease, be highly alert. Then there is the time when people are having sex, to avoid skin lacerations caused by rough explosions, because the skin itself is a certain ability to prevent disease, instantly very small skin damage, but also make the risk of infectious diseases increased hundreds of times. The last thing is to wash in time afterwards, if the cleaning beforehand is to protect each other, the cleaning afterwards is to protect yourself. Because the bacteria infection in addition to the number, but also need a certain amount of time. If you just rest and sleep after intercourse, it will give the bacteria sufficient time and opportunity to infect. Finally, tell your friends that there is no absolute safety to speak of, because some diseases can be transmitted in a variety of ways, and there are others that are not fully understood. But if friends can clean themselves up, along with the effective prevention I mentioned, they can prevent most diseases.