The 26-year-old actress joined her How to Be Single co-stars, Leslie Mann and Alison Brie, on Wednesday's Watch What Happens Live, and answered a viewer's question about why it appeared that there were more nude scenes of her in Fifty Shades of Grey than there were of Dornan, 33.
"Yeah, I'm going to make him get fully naked in the next one," Johnson said of her handsome co-star. "Everybody wants to see the D."
Cohen agreed, adding, "Show us the D. It's the sequel. It has to be bigger and better and more."
Johnson quipped, "Yeah, the Dornan D!"
Mann and Brie fully supported seeing the "Dornan D" in the sequel. "We should start a movement," Johnson quipped. "A campaign."
As for her personal life, when ET spoke with Johnson at the New York City premiere of How to Be Single, the actress revealed the best dating advice she ever received from her famous mother, Melanie Griffith.
"She always said not to compromise myself or my work or my dreams for anyone," Johnson shared. "Especially a dude."