Effects of Aging

It is not clear whether aging itself or the diseases associated with aging cause the gradual changes that occur in men's sexual functioning. The frequency, length, and rigidity of erections gradually decline throughout adulthood. Levels of the male sex hormone (testosterone) decrease also, reducing sex drive (libido). Blood flow to the penis decreases. Other changes include decreases in penile sensitivity and ejaculatory volume, reduced forewarning of ejaculation, orgasm without ejaculation, more rapid detumescence, and a longer refractory period.

See the sidebar Breast Disorders in Men.