We all know the danger of sexually transmitted diseases (STDs), and we also take all kinds of ways to hope to prevent STDs, but, in practice, many people’s practices and understanding of the prevention of STDs is not favorable. 1, before and after sexual intercourse and daily life to the vaginal douche. Vaginal douching can’t wash away or kill bacteria and viruses, so it can’t prevent STDs. Under normal circumstances, adult women’s vagina has the ability to “self-cleaning”, there are some microorganisms that can protect the vagina, such as Lactobacillus, can resist the growth of harmful bacteria. If you douche frequently, you will wash away these germ-resistant substances. This practice destroys the normal physiological environment of the vagina, and also makes the vagina feel dry and uncomfortable, making the vaginal environment more fragile and sensitive, and more prone to infections. Not only that, vaginal douching is also likely to flush bacteria and viruses from the vagina to deeper parts, causing the latter to become infected. (Here refers to the douche inside the vagina, not the general scrubbing vulva). 2.Taking or injecting antibiotics on your own for a little illness. This will cause bacterial resistance and other harm to the body, and will also have a great impact on the treatment of future diseases. 3.Don’t take it lightly if you think the other person’s genitals look clean on the surface, because many STDs are asymptomatic during the incubation period, or the symptoms are very mild, but they can spread the disease to other people. Most of the people infected with STDs or AIDS are infected in the case of the other genitals look very healthy, who will not be in the case of knowing that the other side of the disease also carry out high-risk sex without a condom. 4, extracorporeal emission of semen does not prevent sexually transmitted diseases, especially warts, genital herpes and other sexually transmitted diseases transmitted through the skin mucous membranes or ulcers, as long as there is genital contact there is a possibility of infection. 5, only wear a condom before ejaculation can not prevent STDs. Because sex before ejaculation, has begun a long time of intimate friction, and there will be secretions out, which will carry a certain amount of bacteria or viruses, so the use of condoms is from the beginning of sexual intercourse to wear. 6, after sexual intercourse by jumping or with the finger will semen out also can not prevent sexually transmitted diseases. 7. Oral sex can also transmit AIDS and STDs. Compared with anal or vaginal intercourse, oral sex has a lower risk of HIV infection, but it is not without danger. Oral sex transmission of HIV does not require an obvious rupture wound or bleeding gums, in addition to very small cuts and abrasions to become a portal for the virus to enter, some studies have shown that intact mucous membranes can also be infected with HIV. A study in the United States found that as many as 8 percent of HIV infections among homosexual men were due to oral sex. In addition, gonorrheal pharyngitis, oropharyngeal warts, syphilis and other STDs can be contracted through oral sex. Therefore, it is also important to take protective measures such as wearing a condom when engaging in oral sex. Finally, it is still necessary to remind everyone to reduce the number of sexual partners and use condoms every time as well as throughout the whole process when having sex with people who are not sure of their safety; condoms are the most effective way of preventing STDs and AIDS.