One of the most widespread delusions among people with increased sexual activity is the absolute conviction that they are not carriers of sexually transmitted diseases. If someone claims to be “vetted for everything and clean”, they are either a liar or lied to. There are many common diseases for which either there are no commercial tests or the tests themselves are reliable only when the disease is aggravated and its symptoms appear. For example, chlamydia may not cause disease for weeks after infection, or the disease itself may be asymptomatic, but in both cases, sex without a condom will infect the carrier’s sexual partner. The second dangerous myth is the self-delusion that only vaginal sex can lead to infection. This belief is ridiculous, because any sexual contact with an infected person is an almost certain ticket to painful, demoralizing and expensive treatment for a sexually transmitted disease. The registered cases in Europe alone in recent years indicate that more than 550,000 people fall ill with gonorrhea annually. A large part of them catch the disease after oral sex with an infected partner, and gonorrhea infection of the throat is a curable, but long-lasting and painful disease. It is known as pharyngeal gonorrhea and if not treated properly, it can even affect the lips and facial skin. NEWS_MORE_BOX Avoidance of periodic examinations is due to another widespread myth: “I would know if I had an STD”. Sexually active people, often changing their partners, should know that most sexually transmitted diseases occur with different symptoms, which are mostly individual manifestations. The symptoms may be either too weak or too short-lived to be noticed by both the patient and the doctor. In more than 50% of men and about 30% of women, chlamydial infections occur without symptoms, but can be transmitted to a sexual partner. 2/3 of women and 1/10 of men do not develop symptoms of gonorrhea for months after infection, but can spread the infection. For these reasons, it is extremely important to use protective equipment and to be regularly checked for sexually transmitted diseases – at least every 5-6 months. This interval is reduced to 1-2 months for people with more sexual partners.