The infections of sexual transmission (STI) have a great importance on the health of the world population. Especially its incidence, prevalence and consequence on the health. Sexually transmitted diseases may be contracted by people of any age, race and social standing. More than 20 different diseases are known as STI, they have all in common that they are transmitted during the sexual intercourse. The World Health Organization (WHO) estimates that each year there are 340 million new cases of STIs among the ages of 15 and 49 years. STI must be diagnosed and treated early in order to avoid its propagation. The sexual education is the fundamental tool of the prevention of STI.