I learned that the 'hard' way a few years ago, flew to texas to see my son, wore briefs (I never do but less bulge), the seats were narrow, got hard....felt like my nuts were being pulverized...then to try and stand up and walk past 2 folks with a hard on....no way. I just wanted to rip open my pants and rearange. Finally got off the flight and made it to a restroom stall,,,,I almost yelled in relief when I got my pants down and cock untangled (and dropped a much needed load)... so when flying I ALWAYS where boxers and if i can looser pants. (and try to avoid that damned middle seat)