Old porn

Im looing for an old porn video maybe from the 70's or 80's. There are a few couples out in the country. They get in a camper to go camping. They pick up a boyscout on the way and tease him. Then they end up in some masion with sex slaves in it and are caputred but escape. One of the girls is named kat in the movie. One of the lesbian scenes one woman puts her nipple in the other girls pussy. In another scene a woman is tied up and a guy is below her fingering her telling her to pee on him and she refuses. This ring a bell for anyone?