Clark responds (basically), "Oh, that's only applicable when both are human."
What gets me (IIRC) is that he said "if the other person is human" and Lois is human so by that logic it would be all downhill for Clark after the first kiss. The line just sounded weird to me.
What I liked about it was that Lois was getting all typically scared about a relationship, throwing up her usual walls, and Clark wasn't letting her. Plus, I'm sure my interpretation is what was meant.
VirginiaR. "On the long road, take small steps." -- Jor-el, "The Foundling" --- "clearly there is a lack of understanding between those two... he speaks Lunkheadanian and she Stubbornanian" -- chelo.