Hi Wello. I have the Airhawk R (tourer) model for the ultra. It has the cut outs for the family jewels and coccyx. I also swap it over onto the Deuce. Surprisingly on one long trip I was getting uncomfortable and a lot of heat in the nether regions and took the AH and back rest (which I felt was pushing me forward) off and have enjoyed the riding a whole lot more. Because you need to sit up a bit straighter I sometimes use a motorcross style kidney belt for back support. Takes a lot of stress away. The missus will be OK because she doesn't have to do anything except lean back into the Tour pak.
+1 on the kidney belt for long rides.