How messed up is this?

What exactly are the cops trying to prove here?

Topless woman in park used as bait in police sting - Boing Boing: "Topless woman in park used as bait in police sting
Posted by Mark Frauenfelder, January 2, 2008 11:59 AM | permalink
ABC news has a story and video about a police sting operation in Columbus, Ohio. The cops put a topless women in the park (topless sunbathing is allowed) and waited. A 42-year old man approached the woman. She smiled at him, and at one point playfully put her foot on his shoulder. She asked him to show his penis. A few seconds after he complied with her request, the cops rolled up on the grass in their SUV and busted him."