They say you don't know someone until you've seen them naked.
Actually, no one says that, but it's still kind of true, especially for guys whose "traditional" understanding of masculinity does not include admiring each other's physique.
To explore this concept further, Buzzfeed put together this video titled "Guy Friends See Each Other Naked For The First Time."
In the video, male friends disrobe, revealing their birthday suits for one another.
It's an interesting social experiment in masculinity, friendship and sexuality.
Most of the guys seem pretty cool with the whole idea, especially Kyle and Sethward (great name), who hug and even conclude the video with a little helicopter dance.