Among the many diseases and infections, there are a few which have a gender bias in the way it affects. One very common problem seen in males, but goes without much attention and which gets exploited by quacks is Phimosis. Many males are embarrassed to discuss this with others. In congenital causes it is present since birth. Second bladder - A bulge in the tip of penis as urine accumulates in the prepuceal sac.
Circumcision is the only permanent cure.
This refers to the surgical retraction of foreskin. Following surgery in adult males 10mg stilbesterol is given thrice a day. This produces temporary impotence which prevents erection of penis, because an erection immediately after surgery can be painful - during REM sleep. This is just a post operative phase and will not make a person impotent permanently. REM Sleep - Rapid eye movement sleep a type of sleep.