What does a guy have to do to get some anonymous sex these days?

Last week, Ramsey, Minn. police say, Alan Petrusson tied himself to a tree, put a blindfold on, exposed his genitals and waited for anonymous sex near a public park, according to CBS Minnesota.

"It's the weirdest thing I've heard of out there," Ramsey Police Chief James Way told The Huffington Post. "We have had reports of sexual activity out there though."

Way also said he's skeptical of Petrusson's assertion that he was just sleeping.

"I don't believe that," he said. "That's up to a judge and/or jury to determine, if it gets that far."

Way said Petrusson faces charges of indecent exposure, lewd conduct and trespassing, since the tree he was allegedly tied to was not on park property.

A park visitor who spoke to CBS Minnesota was none too pleased to hear that the park is being used for public sex.