Those studies are bogus. The real question is, does cycling cause impotence. Not "does cycling reduce blood flow".

And the answer is, nobody knows - because nobody's done a real scientific study on cyclists and impotence.

Now, the main problem with seats is that people are sitting on them wrong. If you get a correct fitting to your bike, your "sit bones" of the butt should be the pressure points, and relatively little or no pressure on the soft tissue.

Spongy gel seats make this impossible, because the gel makes the pressure even on the whole seat. So actually, gel seats are worse than a properly fitted hard seat.

Scott