I'll join the club, good to know I'm not alone out there. I've had this problem for about 10 years; pain in the perineum area between the anus and scrotum where a section of the urethra passes.
The first time I was aware of it was when I jumped down from a low wall as in the original post. I think I might have jumped down from something once since but have avoinded doing so thereafter as the pain was so excruciating on each occasion albeit short lived.
I occasionally experience nearly as intense pain randomly every once in while for a few seconds whilst urinating during which I can barely remain standing which has caused several misses I'm afraid to report! Sorry for the gorry details but I just want to make sure I give an accurate account for people to be able to compare symptoms.
I can also occasionally feel an ever so slight amount of pain when I sneeze as some others have commented and I think it has worsened slightly over the years as I now find it too uncomfortable to ride a bicycle and even certain hard chairs are not too comfortable although bearable.
I sometimes feel a slight discomfort at various stages during sexual arousal.
The other symptoms I experience which could be related is slight burning sensation in the urethra near the tip of the penis on occasion while urinating as well as after ejaculation.
I have mentioned these symptoms to my GP before without getting anywhere but I think I will go back now with the list of all these sympoms and ask them for appropriate tests.
Thank you Unifier for your suggestion, I had not thought of a hernia. Although wouldn't it be quite painful most of time when moving about (which is not my case)? I also haven't noticed any abnormalities like holes etc... I'll report any new information from my GP and any test results.