WATCH: Zac Efron and Adam Devine Read a Raunchy Bedtime Story

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Need to know where brothers come from? Look no further.

Zac Efron and Adam Devine are here to educate the masses. In an effort to promote their new movie Mike and Dave Need Wedding Dates in which the actors play brothers, they’re telling everyone exactly where brother come from, just in case you were mistaken.

In the video Efron and Devine take turns reading from a picture book titled “Where Do Brothers Come From” by their movie characters Dave and Mike Stangle. “One day it’s only you on this earth – just mom and dad and plenty of mirth,” reads DeVine. “And then all of the sudden, there is another,” continues Efron. “They call that fucker your little brother.”

After a giggle fit over the word “wiener,” they actors finally get into just how brothers are made. “It starts with a bottle a pinot and a black leather dress, and dad starts dreaming about getting some ass,” Efron explains.

Launch the video up top to hear the entire NSFW bedtime story.