Greta, Monica, Suzel... (1980)

Jacques Gateau with his wife Dominique Saint Claire leads a theatrical troupe round country districts in a red double-decker Leyland bus (passenger entry at rear, but there is no anal in this film!). A rich man asks them to stay at his mansion and performs in a play he has written. This turns out to be hard core and they leave, but their bus breaks down. After Jacques sends his daughter to seduce a mechanic from the next village to repair it and two other girls lead the mechanic off into the woods for a threesome to avoid paying, they return to the mansion and do the play. Jacques' daughter marries the rich man and there is a wedding party orgy on the bus.