NOTE: Basic familiarity with male anatomy is recommended to fully experience this post.
Men's briefs and boxer-briefs come with a part in front where the material overlaps by a couple inches. It's sort of like an airlock—objects can emerge if you intend for them to do so, but not accidentally. (Airlock? Okay, I've been watching a lot of Star Trek while working out recently.) I wonder why this principle is not applied to boxers. Some boxers come with no access ports at all, but most come with what is basically just a slit—the material only overlaps by half an inch or so in general. There may be a button, but often there is not. This does not provide much insurance against accidental exposure to the elements. Since boxers fit much more loosely and usually use thinner fabric, it seems to me that the airlock idea would be more useful on boxers than briefs. I wonder why I've never seen boxers like that. Sure, it's extra material, but boxers are already insanely overpriced; I'm sure they could stand to use three cents' more fabric.