It's from the Pilot, SG91. Lois has arranged to meet Clark at his hotel room, first thing in the morning. He opens the door to her dressed only in a towel wrapped around his waist. From the script:
Clark moves to the door and, momentarily forgetting his lack of attire, flings it open. The expression on Lois' face says she was not prepared to see Clark without his clothes on. Although she does her best to hide it, the sight of Clark's bare chest and rippling stomach muscles has sent her body temperature way above normal. She covers by pretending to be mad.
LOIS:
I said nine. I thought you'd be naked... ready.
CLARK:
I was on the phone. I'll be out in a jiff.
Course, you lose quite a bit of the...impact...on paper.
LabRat
