Could you sit next to your daughter and watch her arse get eaten on television?

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Allison Williams might be the butt of all jokes on the fourth season of “Girls.”

Williams’ character, Marnie, started the season with a sex scene involving her derriére and Ebon Moss-Bacharach, who plays Desi.

When New York magazine asked how filming the awkward sex scene went, the 26-year-old actress called it “total TV magic.”

“I read it in the script and I went into total action mode,” she said. “I got everyone together and I was like, ‘All right, Grace [in wardrobe], you and me — we’re going to come up with something so ingenious that he is going to feel comfortable.’”

Allison, who starred in a live production of “Peter Pan,” says she wanted her rump to “smell like a cake,” adding that she smeared vanilla cream everywhere for Moss-Bacharach’s sake.

From there, they created a garment that was “invisible from the side but that feels like a pillow when he puts his face into it,” she said.

She also told Entertainment Weekly the contraption was quite “elaborate.” “It involved Spanx that we cut away and glued down and involved menstrual pads and two of those weird thongs,” Williams explained.

Her father, Brian Williams, who was by her side at the season premiere party, said he’s not fazed by the raunchiness.

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