Web MD - Numbing genitals
"About 3 weeks ago I purchased an exercise bike and after I ride it, my penis and testicles feel like they are numb. This lasts for a few minutes after I am done riding the bike and then its gone. I used to go to a gym and ride the bike and never had a problem with this until I bought my own. Could this be the seat or the way I sit on the bike or is it an actual problem??"
"I can't be sure but it sounds like the seat is pressing on the perineum in a way that either is pressing on a nerve , or perhaps somewhat more seriously, compressing an artery and restricting blood flow.
I'd try adjusting the seat to positions where this doesn't happen, or else get a different seat. I've got a stationary bike and the seat was just awful. Eventually I was able to get it adjusted ok, but it took a while and a lot of tinkering to get it right."
"Yep it is the seat my friend. Change it to one of the new types that are anatomically designed to cater for our wedding tackle: