Robert Pattinson says kissing Kristen Stewart is no picnic since he’s under so much pressure to give her the “perfect” on-camera clinch.

The vampire stud tells E! Online how difficult it was to film the multiple makeout scenes he shares with Kristen in Eclipse.

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“I think it was actually much easier on the first one [Twilight] because no one had an opinion,” muses Rob.

“But now, two of the producers were actually demonstrating how [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.”

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Meanwhile, the shy Brit assures Twi-hards that his character is all man — unlike, his onscreen rival played by Taylor Lautner.

“If you look carefully, it’s a little easter egg in the film, the censors wouldn’t let the wolves have genitalia,” R-Pattz tells Jimmy Kimmel, about Taylor’s neutered wolf alter ego.

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“It wouldn’t be PG-13 if the wolves had genitalia…They’re like the action figures,” Rob said, agreeing with Jimmy that the wolf pack had been “spayed and neutered” before hitting the big screen.

What about the vampires? “We’re all there,” he boasts.

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