Funny eh,it wasn't my backside that bothered me it was my buns jammed up the tank through slideing forward.
What i did,got a picture of the Wunderlich seat,which has a hump at the front,took it to a seat recoverer in Coventry asked if he could copy it,which he did and i've had it nearly 4 years,although i did buy another secondhand seat in case he cocked it up!!!
I found the S seat's comfort had a lot to do with what I was wearing (you know...thong, shreds, boxers...I'll get me coat)...seriously, in leathers which were quite 'grippy' the seat was fine. Did more than a few 600+ mile days without too much problem.
However, wearing gore-tex armoured trousers it is friggin' purgatory - like Chris said, you just slide into the tank and end up with yer 'arris on the least comfy part of the seat.
Do a search on "Aftermarket Seat" it'll throw up a thread I posted on a while back. It covered the subject of slippery seats (oo er missus ). The guy I used to resolve the slip issue also fits gel pads etc. Found him very helpful and reasonably priced. Might be worth giving him a call?
Then there is that grippy open weave matting that you can buy in the budget shops - in lots of diffrent colours. A friend needed it for his V Storm when two up, works a treat. Some companies are even marketing custom made jobs at about £20. I think one pound for a metre of the stuff from Ahmeds is much more reasonable.
Can't say I've noticed the problem my self but then again I've not ridden my bike for any length of time yet! No tax, MOT, illegal tyre, wet roads, etc.
However, at the recent NEC bike show I sat on K1200 wearing jeans (me, not the K1200!) and no matter how hard I tried I just kept sliding forward until my nuts hit the tank. The seat covering and the slight downwad slope of the design turned the seat in to a bloody slide!
I found that when I raised my handlebars, it allowed me to sit further back on the wider/thicker part of the seat, it became much more comfortable. It also helps to stop you sliding up the tank.
Its certainly related to clothing more than anything else in my case - certain jeans (round town at less than 15mph for the safety concious amongst you) will allow the nads to roll under the arse as you slip down the seat
not recommended....
I find leathers are best as they give more support and I have also adapted my riding posture and tend to ride with the balls of my feet on the pegs as this pushes my whole body back up the seat as the pegs are relatively high, also from track days I find that I automatically brace my knees against the tank under braking which tends to prevent slipping down the seat.
I was pleasantly surprised when I jumped back on the S recently after 2 days of an F650 GS, with the weight not going down your spine and through your cocyxx(?) (arse bone) the seat seems fine to me.
Your right about the Seat V Clothing issue. Leather is great,.. Cordura is a pain. Obvioulsy even in Leather you'll at times need to wear slippery over-trousers. If the seat gets harsh on the arse,.. ride with your toes on the pegs and not your arches. You'll automatically grip the bike with your knees thus releiving pressure on your arse and shoulders/wrists. It's good for another 5 or 6 hours in ths saddle... but please don't tell my 'Controler'