Demi Moore is collaborating with digestive health company Wonderbelly to promote the normalization of flatulence. Moore opened up to her own adult daughters by reading a book that normalizes the taboo topic of farting. In a joint Instagram video shared by Moore and Wonderbelly, Moore asks, “What’s the big stink about?” and reads from a book, An Adult’s Guide to Farts, about the history of flatulence. In the video, she reads to her three adult daughters: Rumer, Scout, and Tallulah. Moore shares her children with actor Bruce Willis, whom she was married to from 1987 to 2000. “I was first introdu…