grabs a naked, greased dude's penis.
No, of course I'm not making that up. Okay, so the villain in Unseen is a new mad scientist type character who has developed a serum that makes him invisible.
The chemical doesn't affect clothing, however, so obviously he needs to be naked in order to sneak up on victims, right?
And he needs to be greased because...well, he probably doesn't need to be greased. He may just be worried about chafing. But being greasy sure comes in handy when someone tries to grab him.
In the climax of Unseen #3, Batman stops the invisible killer while he's attempting to claim another victim, and the two fight. At one point, Batman takes a flying tackle at him, and the pair tumble down the stairs:
And Batman notices that he's naked. How does Batman, master detective that he is, know that the invisible man is naked? Batman's wearing gloves and is covered ear point to cape tip in his own clothing (save for a bit around the mouth). So, clearly, Batman must have inadvertently touched his enemy in a way that made it clear that the invisible man was indeed naked.
Therefore, Batman totally grabbed a naked, greased dude's penis.