South Park: The Stick of Truth - Perverted Achievement

**This is a Missable Achievement **
Achievement - Perverted
You watched your parents have sex for 60 seconds.

During the sequence with the Underpants Gnomes during the main story, you'll come to a part where you're on your parents' dresser in their bedroom and they're having sex in bed. Simply face them in bed and sit idle for 60 seconds and watch until the achievement unlocks.