For the most part, that covers it. There have been a few discussions of this a few years back, that went into more detail. But so far I can’t recall any reports of unicyclists becoming impotent from unicycling. That includes mega-long-distance riders like Lars Clausen and ultramarathoners like Ken Looi.
Maybe they’re just not telling us? No, I trust those guys to give us full disclosure about their unicycling experiences, even if they have to type from a hospital bed in Bangkok.
The bike riders suffering from these problems are mostly roadies who train hundreds of miles a week, week after week. HOWEVER, unicycle saddles are probably worse on the centerline of your crotch than most bike seats. It’s mostly about the angle of our pelvic structures on the seat, vs. the full rider weight there (unless you’re leaning on a handle).
But we’re just not the saddle for the kinds of hours those heavy-duty roadies are. The ones most likely to “abuse” their crotches are people who crank out lots of miles. Just the other day someone mentioned to me he likes riding his Coker as long as there are some hills. If the road is flat for more than 2-3 miles, it starts really bothering his crotch. This is partly because he doesn’t have a big handle to help support some of his weight.
Be sure to shift around if you do lots of long rides. Move the pressure points. Also I like my longer handle on my Coker, which offers me a couple of different hand positions, and allows me to lean forward a bit, and change my pelvic angle to something more like a bike. I think this helps.
But it’s not about the front-to-back curve in the unicycle saddle. The problem area is the side-to-side curve. If your saddle is highest in the middle, it’s putting pressure on the “danger area.” So cutting a slot down the center of the seat not only takes some pressure off of there, It also focuses more pressure near your sit bones, like a bicycle seat. Makes for a more comfortable ride. I used to do the same thing with my old Miyata seats.
Also if you use air seats, you can stick a spacer between the two halves of the tube, so you have tube on the left, right, and a little gap in-between. Even without a spacer, a well-arranged air seat puts less pressure down your centerline.