I'm not telling the whole story online, but highlights.
Allegation of dick pic sending made.
Suggestion of a six pack (photo array) of penises to verify identity made.
Realization the "correct" penis would take up three of the six photos, minimum.
Idea dropped.
(Note this was not a serious suggestion, but was a real investigation. I happened to know the accused and had seen him in smedium running shorts. Dude looked like he was smuggling a sleeve of tuna cans.)