[Venkman watches this little internal struggle with an oddly hopeful expression. Once Egon speaks up, his face lights back up again.]

On which matter? The fact that you're in love with me? Personally, I think it's because I'm irresistible.

[He kisses Egon on the nose.]

Though I don't have a lot of proof of that "hypothesis". You might need to run some tests. Gather data. Follow me back to the bedroom and kiss me some more. You know the drill.