The first time I saw that episode of It's always sunny in Philadelphia called, "The Gang Solves the Gas Crisis", I instantly thought back to "Pretty Peaches" because the father in this movie looks like Charlie Kelly when he's dressed up like the Oil Man from Texas.
Love it when the daughter joins both "Not" Mom , & "Not" Dad in the orgy towards the end! The way she's sucking his cock before he realizess it's her! My Sisters & I used you sneak into Family orgy's like that!