D: we all know it. Those small, narrow hard bike seats can cause impotence problems.
Me, I have a wide padded/spring loaded 'granny seat' on my bike.
I don't like the sensation of bone bruising.
I don't think bikes in China are linked to penile impotence issues.
They don't have our silly seats.
Women, too, benefit. A little-discussed fact is that women with protruding inner labia find a standard bike seat painful. Terrible thing, to be unable to bicycle.
Of course, the recumbent 'lazy boy' seat addresses all these issues.
It also offloads some pressure from the butt to the back.
So forget about a tiny seat on most bikes, trimming maybe 1/2 pound off the bike's weight.