at Billie’s Bar-B-Que (full 10-minute version)

El Paso Wrecking Corp.
directed by: Joe Gage (1977)
Starring: Richard Locke and Fred Halsted; Also featuring: Clay Russell, Guillermo Ricardo, Keith Anthoni (in the motorcycle scene), Mike Morris (father), Jared Benson (son), Lou Davis, Steve King, Aaron Taylor, Robert Snowden, Ken Brown, Rob Carter, Jeanne Marie Marchaud, Veronica Compton, and in non-sexual roles Georgina Spelvin (she plays the bartender), and Stan Braddock (plus other, non-credited guys from the orgies)

I’ll save you more background, but if yer curious, here’s a bit of a write-up for the whole film from a few years back.