Sexual health of a man is an integral part of his life, which affects his psychoemotional state and general health. Any problems in sexual sphere can negatively affect both relationship with partner and entire social life of the person. Unfortunately, an increasing number of representatives of the stronger sex all over the world complain of decreased libido and weak erection, which makes it impossible to have a full sexual intercourse. And doctors more and more often diagnose «erectile dysfunction». In order to select adequate treatment for impotence it is necessary to identify reason for its appearance.