Teigyr: I made sure last year that the Tri shorts I bought (Pearl Izumi) were at least 6" long for that very reason (http://www.triathletesports.com/2008...-0427-7ab4.htm). The 6" seemed to be just enough for me, but I think I've seen 8" also (here's a pair... http://www.triathletesports.com/2008...rspe6a-7b9.htm).

The worst nightmare -- not just rubbing, but rubbing when WET! OUCH