Gents - I know this thread has been around. It must have. But I can't find it.
Here's the problem, I ride my bike for 30 minutes or so and I'm feeling OK. I dismount the bike and I'm numb in my perinneal area. I can transition, run, etc. But the area is numb.
This is a really sensitive subject. I had this problem for a while on my long rides. It's all about body position and seat angle. You may want to play around a bit with the angle of your seat first to see if this helps. I find that when I stay in the same position for a long time I start to get numb and it really sneaks up on you. Kind of scary actually. I try to change my position slightly now and again and this helps.
I adjusted the tilt on my bike seat. I did raise my seat height a little. Since then I've felt numbness. I may have gotten my answer. I'll give it a try.
Sneaking up on seat angle and height will help you get into a better position. But changing position when riding long, every so often, has helped with numbess in wrists, hand and the nether regions.