what is the cause of it?
Surgical intervention may remove anatomical structures necessary to erection, and  is associated with bicycling due to both neurological and vascular problems due to compression
Erectile dysfunction
Surgical intervention for a number of conditions may remove anatomical structures necessary to erection, damage nerves, or impair blood supply. ED is a common complication of treatments for prostate cancer, including prostatectomy and destruction of the prostate by external beam radiation, although the prostate gland itself is not necessary to achieve an erection. As far as inguinal hernia surgery is concerned, in most cases, and in the absence of postoperative complications, the operative repair can lead to a recovery of the sexual life of people with preoperative sexual dysfunction, while, in most cases, it does not affect people with a preoperative normal sexual life.

ED can also be associated with bicycling due to both neurological and vascular problems due to compression. The increased risk appears to be about 1.7-fold.
a substance that binds to a receptor and has an agonistic or antagonistic effect is called Receptor antagonist can you give a few examples? Alpha blockers, beta blockers, and calcium channel blockers how is the first one classified? UNANSWERABLE does the first mentioned example have any side effects? Yes, dizziness, drowsiness, weakness, fatigue, psychiatric depression, and dry mouth does it also have any scientific/health use? Yes, used to treat Raynaud's disease, congestive heart failure (CHF), pheochromocytoma, and erectile dysfunction what is the meaning of the last mentioned disease? It is the type of sexual dysfunction in which the penis fails to become or stay erect during sexual activity
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Erectile dysfunction [SEP] Causes
Causes of or contributors to ED include the following: Surgical intervention for a number of conditions may remove anatomical structures necessary to erection, damage nerves, or impair blood supply. ED is a common complication of treatments for prostate cancer, including prostatectomy and destruction of the prostate by external beam radiation, although the prostate gland itself is not necessary to achieve an erection. As far as inguinal hernia surgery is concerned, in most cases, and in the absence of postoperative complications, the operative repair can lead to a recovery of the sexual life of people with preoperative sexual dysfunction, while, in most cases, it does not affect people with a preoperative normal sexual life.