Why not just whip it out, because manners or class can not be holding them back?
DEAR ABBY: There is a man at work I'm very attracted to. He seems to be equally attracted to me. The problem is, he has shown me two pictures of his privates that he has on his cellphone. When he did it, it wasn't completely out of context of our conversation and our interest in each other. We do not have a physical relationship (yet), but I'm considering it. How weird is it that he has these pictures on his phone? -- GOT AN EYEFUL IN ILLINOIS
DEAR GOT AN EYEFUL: That must have been some conversation! It's amazing either of you get any work done with so many pheromones floating in the air. From my perspective, what your co-worker did was "premature" considering you have no social relationship (yet). It could also be considered a form of flashing.
However, while I consider what he did to be overexposure and not a particularly impressive courtship technique, displaying pictures of his anatomy on his cellphone is not unheard of among men who think like adolescents.