Police in Philadelphia are searching for a man, known as the Swiss-Cheese Pervert, who reportedly drives around without any trousers on and offers women money to watch him pleasure himself using sliced cheese.
Women have reported being approached by the "white, heavy set male".
The man’s actions were brought to the attention of residents via the Mayfair TownWatch Facebook.
"Good Morning Mayfair!" the Facebook user writes, "Please be aware of the Swiss Cheese Pervert! This individual is driving around surrounding communities and exposes himself to women.
"He offers them money to watch him put swiss cheese on his privates. He is a white, heavy set male, 40-50 years old. He drives a newer model silver sedan. He was also spotted in a black newer model sedan."
It goes on to urge potential victims to not confront the man, but to note his car registration and call the police immediately.
According to the Philadelphia Daily News, the man allegedly set up a profile on dating website OKCupid to advertise his fetish.
It reports that a woman in the area received a message from a man who said: "I started to compare girls to cheese due to their milky complections [sic], girls are soft, smooth feeling and tend to like dairy products more.
"That and typical advertising, always using a girl to advertise dairy products.
"So cheese is what I started to use as a replacement for having sex with girls."
The police Special Victims Unit have launched an investigation into the incidents, and have stressed that it is a serious offence and traumatic for those who have been approached.