>Eurika!

I have a masterful idea, please let me know what you think of this:

The problem with underwear:
Briefs just make everything stuffy.
Boxer briefs are better, but the legs ride up and it still holds everything up against the crotch.
Boxers are great, but it’s either one side or the other. The side with fabric is nice, it feels comfortable, but the other side is constantly rubbing.
You can move to the other side to give equal opportunity, but it’s never a win/win situation.

The solution:
A “pocket” for the scrotum in the underwear. A sort of “change purse”, but with very loose elastic. Just slip the boys in and you’re free and clear. No matter which leg they may be closest to, you won’t have any rubbing, and it will keep them dryer as there’s more air flow. It could be any type of fabric, but what about some really soft cloth in a loosely woven knit. Open squares, like a net. It would cut down on the swinging, too, for those with a large balls to dangle ratio.