Most guys pull them on every morning when they step out of the shower. In fact, at this very moment, there's probably nothing closer to you than your underwear.
It's taken thousands of years to perfect the boxers or briefs that you're wearing right now, though, so here's a brief and incomplete look at the history of men's underwear:
Loincloths offer some coverage
A postcard inspired briefs, while the Secret
Service gave a boost to boxers.
Ancient Egyptian art shows everyone from the pharaohs on down the line decked out in loincloths of their own. The pharaohs even wore a sort of specialized kilt/loincloth called a shendoh, and took extra supplies of the garment into their pyramids for use in the afterlife.
Codpieces become all the rage
Variations on the loincloth seem to have persisted into the Middle Ages, when loose-fitting trousers called braies came into fashion. These linen duds extended from the waist to around mid-calf, and once the wearer stepped into his breeches he had to lace them tight around his waist and shins. Although all of the tying wasn't so convenient, these braies had the advantage of offering a lot of coverage, so if a laborer got too hot he could strip down to his skivvies while still maintaining some sense of decorum.
On the other hand, all of the lacing and cinching made answering nature's call a bit of a hassle. Enter the codpiece. A codpiece that opened at the front using buttons, snaps, or laces enabled men to urinate without removing their braies, which really came in handy when you'd had a bit too much mead.
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These early codpieces were practical, but as hemlines rose, they started to take on a decorative function, too.
When Henry VIII began to pad his codpiece in the 16th century, all of his loyal subjects followed suit. (Nevermind that scholars later speculated that Henry VIII's bulging codpiece may not have actually been male overcompensation -- it may have been oversized to accommodate medication-soaked bandages to alleviate some of the pain from a suspected case of syphilis. It's worth noting that modern scholars have mostly dismissed this theory.) Codpiece padding and growth continued throughout the mid-sixteenth century before tailing off around 1590.