This is complete and utter entrapment bullshit. Here is an excerpt from the story, and you can follow the link if you want to see how contemptuous today's police officers are of your rights.
ABC News: Topless Woman Lured Perverts for Police
Robin Garrison, an off-duty 42-year-old firefighter, was walking in Berliner Park in Columbus, Ohio, in May when he saw a woman sunbathing topless under a tree.
He approached her and they started talking and getting comfortable, the woman smiling and resting her foot on his shoulder at one point.
Eventually, she asked to see Garrison's penis; he unzipped his pants and complied.
Seconds later, undercover police officers pulled up in a van and arrested Garrison; he was later charged with public indecency, a misdemeanor, based on video footage taken by cops who were targeting men having sex or masturbating in the park. While topless sunbathing is legal in the city's parks, exposing more than that is against the law.
When a stranger walks up to you and flashes their genitalia, they are a pervert.
When you've been chatting someone up for a while, resting your foot on their shoulder, and you ask to see their genitalia, it's called 'a date'.
Robin Garrison is guilty of poor judgment, since he should have asked her to buy him a drink first. Obviously, he should have suggested a club that allows such behavior. Still, it wasn't his idea to expose himself, and if that isn't the definition of entrapment I don't know what is.