system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 71-year-old man comes to the physician because of decreased sexual performance for the past 2 years. He reports that it takes longer for his penis to become erect, and he cannot maintain an erection for as long as before. His ejaculations have become less forceful. Once he has achieved an orgasm, he requires several hours before he can have another orgasm. He has been happily married for 40 years and he has no marital conflicts. His only medication is esomeprazole for gastroesophageal reflux disease. Examination shows coarse dark pubic and axillary hair. The skin of his lower extremity is warm to the touch; pedal pulses and sensation are intact. Rectal examination shows a symmetrically enlarged prostate with no masses. His fasting serum glucose is 96 mg/dL and his prostate-specific antigen is 3.9 ng/mL (N < 4). Which of the following etiologies is the most likely cause of the patient's symptoms?
assistant
Physiologic