Well, that certainly got your attention.
"I think it was actually much easier on the first one [Twilight] because no one had an opinion," reveals Rob about swapping spit with his costar, before adding with a laugh: "But now, two of the producers were actually demonstrating how they [Edward and Bella] should kiss because it's such a big part of the series now and everyone thinks we have to get it perfect."
Hey, it's a tough job, but somebody's gotta do it.
So, will any of that on-screen smooching be on display at the Eclipse premiere this Thursday? Find out when we'll be live streaming the entire red carpet right here on E! Online starting at 5 pm PT/ 8 pm ET.
Photos: Total Eclipse