Try a split seat. You can find them in almost any bike store and they do help.
+1 Don't tell the bikers here but most of the men are doing permanent damage to the main vein running to the penis. In 10 years they will be wonder why they can't get it up.
From the link I posted above:
Impotency/Prostate IssuesThere has recently been a great deal of hysteria on the subject of cycling-related impotency. The thrust of the argument is that the rider's weight flattens the penile arteries against the saddle, reducing blood-flow capacity of these articles, which are required for tumescence.
I can't claim any medical expertise, but it is my opinion that these problems in most cases are related to poor adjustment or poor choice of saddles, such that the rider's weight is not being carried properly by the "sit bones." In particular, having the saddle too high or tilted down too far, will lead to the rider's sitting on the narrow part of the saddle, which may block these arteries, and also possibly do nerve damage. This sort of mismatch can also create pressure on the prostate.
Cyclists who have problems with this, or who regularly experience numbness, should experiment with saddle position so that the sit bones are carrying their share of the load. Cyclists with persistent problems should consider switching to a recumbent, since recumbent seats are thought to eliminate this sort of problem.
[These problems, and many others, can be caused, or worsened, by obsessively riding long distances, well beyond when pain begins. Listen to what your body is telling you! I used to have moderate penile numbness after riding more than 75 miles, but it went away within a day or two. This no longer happens -- possibly because I use better saddles and am better at adjusting them, and probably also because I rarely ride more than 60 miles in a day. -- John Allen]
Split SeatsOne "solution" that has been tried and abandoned many times over the decades is the split seat. This type of seat has two roundish pads, side by side, usually on a horizontal bar. Frequently the pads can rock up and down within a narrow range. This type of seat has no central "nose" and for this reason it is sometimes believed to be a good choice for riders with prostate or penile numbness issues.
Unfortunately, this type of seat commonly causes more problems than it "cures."
The lack of a nose can compromise lateral control in some cases.
The pads must be angled downward, which tends to make the rider slide forward. This is liable to lead to hand/wrist/neck problems as the rider braces on the handlebar to keep from sliding forward off the seat.
If the pads are not angled downward, they tend to cut off circulation to the thighs, and to interfere with the thigh muscles.
This is a design that looks good on paper, but works poorly in practice.