Impotence is the inability to achieve enough stiffness of the penis to enter the vagina and have intercourse resulting in ejaculation. It is normal for most men to have an occasional instance of impotence when tired or nervous. When impotence becomes a pattern or a long-lasting problem, however, it can profoundly affect the emotional lives of men and their sexual partners.
Impotence affects older men more than younger men.
Midlife and the later years bring changes in circulation that may affect the sexual organs. Couples need to be more open and understanding with each other about sexual problems such as impotence. Fortunately, impotence can often be cured. An erection is caused when there is increased blood flow into the penis and the penile veins clamp down to make sure the blood is trapped there, causing stiffness. Nerves in the penis provide the sensations of pleasure and help maintain the erection until ejaculation.