While I was in San Francisco during this past Spring Break, I did (of course) stop by Mr. S, and I found these “chaps” underwear from Locker Gear that are totally crotchless. Super hot to me! And as you can see in the second pic, they can be paired with a jock to create some layers (the jock is completely separate, you have to use your own).
It also comes in red and blue accents if that’s more up your alley.