Impotence

Persistent inability in a male to achieve or maintain a penile erection of sufficient rigidity to permit satisfactory sexual intercourse, in the absence of ejaculatory failure or diminished libido; typically reflects vascular (heart disease, atherosclerosis), neurogenic (diabetes, multiple sclerosis, prostate/bladder surgery, spinal cord injury), hormonal (obesity, tobacco, alcohol), medications (antihypertensive, antidepressants, antihistamines, chemotherapy, antiandrogen), or psychogenic dysfunction (depression, anxiety, stress, conflicts).