Moss-Bachrach already confirmed to MTV News that the scene was 100% legitimate face-to-butt contact -- which means that the only question left to ask, really, is how Allison's father, news anchor Brian Williams, handled seeing it onscreen.
Fortunately, Brian Williams isn't a regular dad; he's a cool dad. So when Vulture caught up with him at the show's premiere, he was happy to weigh in:
"She’s always been an actress," Williams said. "For us, watching her is the family occupation and everybody has to remember it’s acting, no animals were harmed during the filming, and ideally nobody gets hurt."
And in the same piece, Allison Williams mentions that not only were her parents proud supporters of her big butt-eating moment, but that her mom was a chief strategist when it came to rigging a bit of costumery between the actress's cheeks, so that her co-star's time in there would be as comfortable as possible.
"I’d get a call from my mom and she’d be like, 'Maybe if you took a thong and cut it away from the sides but you stuck it on in the front and the back it could work,'" Williams said. "I was like, 'Mom, I like your thinking.' Just your regular dinner conversation! We’re changing as a family; it’s lovely."
Lovely! Yes, that is just the word we were thinking of. LOOOOVELY.