The alleged incident occurred on a flight from DC to Syracuse, and the guy denies it.

Story contains one of the best lines ever in a news article:

When he got off the plane in Syracuse, police took him into custody and checked to see if he was wearing underpants, which he was, Gibeau said.

But I don’t think this is actually illegal:

Police searched Gibeau and found five Polaroid photos of his penis, according to Bragg’s affidavit. Gibeau said he was bringing the photos to his girlfriend to show her the contrast between the sunburned areas of his body and the areas that weren’t exposed on the beach.