Serbia's capital may have an abundance of dog poop, but this cheeky series of ads from McCann Erickson Belgrade proves that the town doesn't have a shortage of nice butts. And when residents bend over to clean up said dog droppings, they're helping create a "beautiful city" in more ways than one. Notice, though, that the three lady butts (one below, two more after the jump) are appealing and demure, while the lone male in the series has his underpants riding up and is grabbing an obvious handful of poop. I guess the “girl bodies are sexy, guy bodies are funny” theory isn't limited to the United States. Via Ads of the World.