If Wayne knew - he wouldn’t touch that... But he doesn’t. That makes the situation even more awkward. (fyi - Peter’s tongue is sensitive, it’s like a freaking G-spot. Dude gets aroused if someone touches it.) It’s almost the same as yanking his... well, private parts. I guess. Don’t do that. Take out the guy to dinner first? Though, Peter committed a big no-no here - he got into Wayne’s personal space without permission. And Wayne hates that very much. He barely lets people he knows very well, to touch him without permission (like hugs, handshakes, caressing, etc). He’s hesitant to allow people into his personal space. Yet if he’s invading someone’s space (and he does it often) - it’s a good sign of sympathy from his side.