Do any of you know exactly what too much hot tub use does to the penis? I've often heard that it can inhibit erections. Is that true? Does it cause physical ED, either temporary or permanent, or is it just an old wives tale?
And what about guys doing intense bike riding? Say a guy's doing 2 hours of intense biking, 3-5 days a week. Can that cause physical ED, either temporary or permanent?
If you know where I can read scientific research on this, please post the link.