Two observations........
First, look at the avatar. I think that monkey knows something!
Second, Is the guy on the left "
going commando"?
When did the term "
going commando" enter the civilian lexicon? The phrase dates back to at least the middle of the 20th century, when Americans used it to mean "toughening up." (That meaning persists to this day in some contexts.) The phrase's more common connotation dates back to at least 1974, when it appeared in a source on college slang. The phrase "crotch rot" emerged during the same period: It first appeared in 1967. It's possible that "going commando" first poked its way into the public consciousness during the Vietnam War, when American special forces were spending extended periods in hot, wet jungle environments. The phrase got its big break in 1996, when Joey and Rachel went commando on an episode of Friends.