Unless all sex partners are treated at the same time, they may infect each other again and again. It is especially important for a man to tell a woman. This is because many women do not have symptoms until the STD has reached a more serious stage. If friends have symptoms, urge them to seek care. The only truly safe sex is abstinence.
Most people think that kissing is a safe activity.
Unfortunately, syphilis, herpes, and other diseases can be contracted through this relatively simple and apparently harmless act. All other forms of sexual contact carry some risk. Condoms are commonly thought to protect against STDs. Condoms are useful in preventing certain diseases, such as herpes and gonorrhea.