Sexual drives for both men and women gradually decrease with age. Stress and anxiety from the strain of daily life, relationship or family problems, and mental disorders are among the many factors that can affect sexual desire.
Sometimes, however, loss of sex drive is related to an underlying condition. For men, depression and stress often contribute to loss of sex drive. Sometimes the culprit is a decrease in male sex hormones due to an endocrine disorder. In other cases, loss of sex drive may be a medication side effect.