I think some shorts have too much chamois material up front, which bunches & rubs against the sensitive areas. I have recently been having good success with a different chamois design that has something akin to a cutout, or channel, in the chamois area up front. Check out the pictures on TE of the chamois on both the new Etxe Ondo & the Louis Garneau AirGel or Carbon Ionn, both brands have this feature. Just that little bit of relief keeps the front of the chamois from getting up in there & causing soreness.