When Hayley and whom she believes is Bill but is really Stan head off to a resort for a weekend. Hayley shocks Stan by her announcement of having sex with him and starts singing about them Doin' It in "Pulling Double Booty".
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Lyrics
Hayley: Doin' It, doin' it
D-d-doin' it
Should we break for lunch?
No, let's keep
Doin' It, doin' it
Someone's at the door...
I don't care!
We're doin' It, doin' it
Wanna put on our hiking boots?
Yeah, we'll wear 'em while we're
Doin' It, doin' it
I like the rhythm, it is my method