Sydney: 
Luthor? Sweet? It's an oxymoron!
On Lois'sofa? IMPOSSIBLE.
But Lois slept on it? (or will in S4, E1.) Anyway, he could have always floated... no, that wouldn't have been good for other reasons.
Insider information makes the bet null and void.
I still think it's Luthor: he is a pervert.
Or because he was reviewing the tapes back in Part 31/32?
Of course! That WE can believe!
Reverse psychology always works on Lois. One of the reasons she DOESN'T need therapy.
