It depends on the context.
If it was a ton of friends in the room at the same time (which there were here), I'd probably tell my daughter, "yeah, that probably sends a message you don't realize you're sending... here's how boys think about things like that", and she'd get "the talk".
If they were absolutely alone in the house and I came home and saw them hanging out like that in the bedroom, the conversation would be with him and whether or not he's got the glow, because that's all that's going to save him.