This paper discusses the issuses of sexually transmitted diseases. The paper emphasizes especially the types, prevention, and the treatment of these diseases. The whole problem is discussed primarily from the medical point of view, but also from the sociological, and therefore, except in clinical, the sexually transmitted diseases are discussed in the context of sexuality as the social phenomenon. The emphasis is also put on the feminine and adolescent population as especially vulnerable groups in the context of sexually transmitted diseases. As sexually transmitted diseases are not only global medical but also social problem, the paper also pays attention on these aspects. Also, as there is still no effective cure for the most of sexually transmitted diseases that can completely delete it, the paper greatly emphasizes the importance of prevention, and good prevention cannot exist without the education. Therefore, using clear and strong arguments, the paper tries to emphasize the importance of good education and prevention. Especially, except the influence on physical, sexually transmitted diseases also have the influence on the mental health of the individual. For clearing this subject, the paper also examines the motivation of the individual and groups for entering the risky sexual intercourses. Very often, women enter this kind of sexual intercourses because of the fear of losing the partner and the adolescents usually experiment and they are convinced into their own vulnerability. All those motives are very dangerous, so the paper also emphasize them to ease the finding solution of this problem at least a little in the future.