CBS Denver reports that police say since July there have been multiple reports of a male wearing thong underwear, running and exposing himself, and "self-stimulating" in North Denver.
The man has mostly been observed in alleys.
He's described as a white or Hispanic male, 25 to 35, and 5-foot-8 to 6 feet tall. He's approximately 140 to 170 pounds with a slim build and dark hair.
Police said the suspect has been seen with a beard and glasses, and usually carries his pants or shorts in his hands.
And he's usually wearing a thong.