The Insider.com

Robert Pattinson sure knows how to drive his female fans wild.

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With the 50 Shades of Grey phenomenon still going strong, and author E.L. James admitting the story is based on Twilight fan-fiction, Robert and Kristen Stewart were asked about the "mommy porn" trilogy during their Comic-Con interview with MTV.

Video: 'Twilight' Stars on Their Emotional Last Comic-Con

"I just sit there and lick the pages," Robert joked when Kristen was asked if she has shared the novel with her male Twilight co-stars. "What are we live on?," he quickly asked, regretting his comeback. "Is this actually happening?"

Kristen of course, was characteristically much more blunt about the idea that her, Robert and Taylor Lautner were all reading the novel together "in a book club."

"That would be disgusting," she said.

Pics: Dream Casting -- '50 Shades of Grey'

Check out the video at the 04:07 mark to get their embarrassed reactions.