STD is the abbreviation for sexually transmitted disease, also known as STI (sexually transmitted infection). This infection is spread between people mainly through sexual contact, such as direct contact with genital ulcers, bodily fluids, or even skin around diseased genitals, and includes: chlamydia, genital herpes, genital warts, gonorrhea, hepatitis, HIV (Human Immunodeficiency Virus), HPV (Human Papillomavirus), syphilis, etc. Safe sex is defined as taking steps before and during sexual activity to avoid infection or to avoid passing infection to a partner. The following are ways you should act to reduce the risk of STD infection: Before sex 1. know your partner, including his or her previous sexual history; 2. do not feel forced to have sex; 3. do not have sexual contact with anyone other than your partner, and your partner is someone you know who does not have STD; 4. before having sex with a new partner, both partners should be screened for STD and inform each other of the results; If you do have STD, inform your partner and let him or her make the final decision; if you agree to have sexual contact, wear a condom (condom material should be latex or polyurethane – strong) During sex 1, use condoms every time you have sex and for all forms of intercourse; 2, make sure the condom is in place throughout sex; 3, STD is sometimes acquired through contact with the skin around the diseased genitals and condoms cannot 4, the application of lubricants, can effectively reduce the chance of condom rupture; 5, lubricants only use water-soluble, other types of lubricants can cause latex softening or rupture; 6, polyurethane condoms are stronger than latex, but more expensive; 7, condoms with spermicide best not to use, some reports found that it increases the chance of HIV infection (do not know why ha); 8, keep Sober, alcohol or drugs can interfere with your judgment, haphazardly choose a partner, forget to wear a condom, or condom use improperly can happen. If you are sociable and sexually active, get screened for STD regularly. Most STDs have no obvious symptoms early on, so frequent testing is needed in cases of frequent sexual exposure. If detected in time, even if one is infected with STD, treatment is much more effective than if it is detected late, and the chances of infecting others are reduced. There are commercially available vaccine products abroad that are very effective against HPV. Vaccination can prevent male genital warts and HPV from causing cervical cancer in women. The easiest thing to do for safe sex is to use condoms, but how much do you know about condoms? What to use and how to use it? First of all, it is crucial to treat condoms well, use them every time, use them correctly and use them throughout.