Intimate infections are questioning this popular slogan. Today, most sexually active people are exposed to sexually transmitted infections. In Poland and worldwide, there is a steady increase in the number of venereal diseases. This concerns mainly syphilis, chlamydiosis, gonorrhea and trichomoniasis. This trend results, among others, from increased sexual freedom, the popularisation of tourism and the popularisation of hormonal contraception. The concept of ‘safe sex’ is mistakenly interpreted as that which does not lead to pregnancy. In practice, any sexual act without a condom or a dental dam should be treated as dangerous sex. Testing for intimate infections is recommended for every sexually active person, especially after intercourse with a new partner. A lack of symptoms does not mean a lack of infection.