Real men go KILT commando.
(Oh, was that not inclusive enough for the feminists easily triggered?? Well, you are hereby invited to go commando also... I'm all about equal opportunities. )
First serious reply -- boxers let you dangle at an angle and get pinched/crushed. No wai. Briefs clamp you up to your preferred level of panic, but none of that is right to me. I prefer boxer briefs. It's a thing, look it up.
Sorry I've been away. Yes it is genuinely relating to hygiene. There are hygienic considerations to it. Skidmarks for one. Sweaty oily cotton fabric compressing against open orifices on your body seems like a bad idea to me. Also it just feels so much more comfortable. I havent worn anything underneath for decades.