Trivia Question: Who was Rogue's first kiss in Marvel publication history? Hint: It's the most awesome possible character, of course. (Scroll down to see who it is...)
Hell yeah, it's ROM THE SPACEKNIGHT!!! (Fooled ya, maybe?)

This is Rom #32, which I believe is just Rogue's third appearance ever as a character. She first appeared in Avengers Annual #10 (August 1981), then Uncanny X-Men #158 (June 1982), and then here in Rom #32 (July 1982).
Of course, the kiss doesn't really do anything because Rom's an alien cyborg -- although the follow-up panels give Rogue a stunned expression, with a caption that says it's her first experience with true decency, and, "She finds that she... likes it." Which leads Siskoid over at Blog of Geekery to conclude: "There you have it, folks: Rom is so The Man that one kiss from him turned Rogue to the Light Side of the Force."
Man, I love me some Rom. (I mean, not in
that sense. Not that there's anything wrong with it.) Big thanks to
Siskoid for the Rom retrospective and scans.
Edit: Fooled you again! Via the comments, poster Agent of W.E.R.Q., points out that Rogue actually did kiss someone in the earlier Avengers Annual -- Captain America, while unconscious, successfully stealing his powers.
Mea culpa. Well, it was nice to think about!