I remember 30 years ago when I rode my Raleigh Record that I got numbness down there. I'm just getting back to riding with a hybrid bike this last few weeks.

I had cancer in my neck in 2001 (surgery & radiation) and later had prostate biopsies for 4 consecutive years due to high PSA. I recently had a prostate MRI for the first time and other than being enlarged the results showed no abnormalities.

I just today read this thread and it made me think. I've been sedentary for a long while so I think the benefits of biking out-way the unknown.