Erectile dysfunction is not a separate disease, it is always a consequence of deeper negative changes in the man’s body. Its danger lies in the fact that it can cause a vicious circle – erectile dysfunction causes psychological discomfort, which, in turn, contributes to the aggravation of the disease. Regulation of an erection is a fairly complex mechanism that involves the nervous, endocrine system and the penile vessels. The definition of erectile dysfunction refers to the inability of men to cause and maintain an erection at a sufficient level to satisfy the sex drive. Our site helps you learn more about the proper functioning of an erection and how to achieve it.