Sexuality of the elderly.

Partial androgen deficiency of the aging male is associated with symptoms collectively accepted as the andropause syndrome. The underlying hormonal changes, the definition of age-dependent cofactors for changing sexuality, and the data on decreasing erectile function are the main topics of this critical analysis. Alterations in libido, ejaculation and sperm quality also have to be considered in order to define a change in male sexuality as part of the natural process of aging.