Male sexual dysfunction may be divided into disorders of the libido (hypoactive or hyperactive), erectile dysfunction, and ejaculatory disturbances. Lack of female libido relative to the male libido is seen by men as the main female sexual dysfunction. An alternate view would be to say that male libido is too high compared to female libido.
Age-associated sexual dysfunction in both men and women is frequently tied to chronic illnesses, such as arteriosclerosis ("hardening of the arteries"), hypertension, diabetes, and depression. Other causes include prostate enlargement (in men); endometriosis, fibroids, and PMS (in women); and age-related declines in hormone levels in both sexes. Sexual dysfunction is also a common side effect of many prescription and over-the-counter drugs, including those for depression, high blood pressure, insomnia, and allergies.