There is a very interesting research I read from Science Daily regarding how changing bicycle seat from traditional one to the no-nose one relieve constant pressure in the perineal region which were believed to have cause genital numbness and less penile tactile sensation.
The finding were conducted in a 6 month period from Ninety bicycling police officers from 5 metropolitan regions in the U.S. (Northwest, Southern, Desert West, Midwest, and Southeast). They were evaluated prior to changing seat then again after 6 month of using no-nose saddles.
"The findings show that use of the noseless saddle resulted in a reduction in saddle contact pressure in the perineal region. There was a significant improvement in penile tactile sensation, and the number of men indicating they had not experienced genital numbness while cycling for the preceding 6 months rose from 27 percent to 82 percent using no-nose saddles. " (Quotes from Science Daily) "Use of the noseless saddle also resulted in significant increases in erectile function as assessed by the initial evaluation, but there were no significant changes noted in Rigiscan® measures, a method used to record penile rigidity while the subject sleeps. With few exceptions, bicycle police officers were able to effectively use no-nose saddles in their police work and 97 percent of officers completing the study continued to use the no-nose saddle afterward." (Quotes from Science Daily)
This is the link to the article: "No-nose Bicycle Saddles Improve Penile Sensation And Erectile Function In Bicycling Police Officers"