Dirty Lily (1978)

Once upon a time a little girl grew up to be a very stacked young lady...When, Lilly, called Dirty Lilly by her friends, got too big and too hot for her mother to handle she was thrown out into the world on her own. So begins her search for daddy, who left mommy so many years ago. Her first stop is daddy's lawyer who has some quasi-legal ideas regarding her. Following some office fun, the lawyer sends her to the set of a porno film where daddy was seen last. There mistaken for the star, she plays her part with gusto and is given the next clue to daddy's whereabouts by the director who steers her to daddy's mistress, Ginger. They romp together and after a series of exciting adventures, including an interlude with a kinky muscleman, she finds her daddy - much to her surprise.