Dunno what your problem with this 'undefined problem' really is UPete?! :dontknow:
It's arguably significantly more 'defined' than many of the questions/problems that we see & confidently make some effort to answer here on this Forum; probably with no more specific success (or definition?!) than all those many other 'which oil/revs to use/gears to select/tires to fit/tire pressures to suit/suspension settings/air bag pressure/way to corner best/lights to fit; and the list goes on & on...(& on & on & on....)' posts?! Why express any confusion over this particular question vs any one of those many others?? Don't we usually just share what we DO know & then let the 'asker' pick & choose from the offered answers or suggestions?! Besides, no-one is actually forcing you to read the post &/or whole thread or to offer any solution or comment, that's just a choice you get to do so, or not, as the fancy takes you!? :dontknow:
As for the OP's particular problem, it's a tad dfifficult to put this in a way that is clear & yet still suitable for polite company, but I'll give it a go! Sorry that this polite version is so long, but if you bear with me & read on thru to the end, it could be enlightening! :yes:
Way back when, I was involved with developing & training 'new riders' on those big bikes with large white fairings & lotsa flashing lights that most of us get to see (in the rear vision mirror maybe?) around the highways & by-ways every now & then &/or escorting the Prez's limo somewhere. Now back then, we often found that the ummm, let's say 'tubbier' fellas amongst these new riders, tended to find it easier to arch the small of their back forwards, roll the top of their hips forwards and let their belly relax as it hung out front, at the same time as allowing the small of their back to arch forwards but look/feel like they were sitting up straight... They did this instead of engagiing their core, sucking their belly in a bit, and sitting tall & straight all the time! This sag forwards thing is easy enough to relax into & will still look sorta alright, but it has a real tendency to rest the fella's wedding tackle on the seat.... Over the duration of just one riding shift, this can put pressure on the all important muscles & nerves that control said fellas wedding tackle such that he might get that fairly upsetting numbness that you are concerned about Mikey! :shocked:
The answer to this particular numbness is to sit forward a bit more, suck in your gut just enough to engage your core muscles, roll the top of your hips BACK & DOWN while straightening your spine UP by imagining the top of your head being lifted by a cord running thru it & on down into your spinal column, pulling everything up & straight while you relax the muscles across the back of your neck & let your shoulders relax back & down, letting your wrists & elbows relax & drop too, all while you grip the bike gently but firmly with your knees so that your upright body becomes an integral part of the bike. Do it right and you'll sit/ride while looking like a smartly upright motorcycle cop who is an integral extension of his bike who is gonna look great escorting the Prez but is still able to erupt at a moments notice into someone ready & more than able to make Evil Kneivel & RoboCop look like the amateurs they are by comparison to this well trained & finely tuned professional rider! :thumbup:
Do that & you shouldn't ever get that uncomfortable crotch numbness again; and if you do get it right, it'll also help strengthen & maintain your core muscles as well as enhancing those muscles & nerves that are responsible for your wedding tackle's involvement in those functions requiring it to stand tall & proud. Sitting up & riding right in that manner is one of the few really beneficial activities short of the real thing that can improve a fella's 'pelvic floor' & his control over his wedding tackle.... but you don't hafta just trust me on that, simply check back with your Missus after a couple of weeks of practice on getting your riding seat right!

hyea:
But if you'd rather hear the brutally short & blunt version, try this: "Just sit up straight, suck your gut in, & lift your balls off the seat, man!" :shocked:
Enjoy! :thumbup: