Supercharger(1970)

Bob Jackson, Tony Black and Bob Quint star in a wild story of super-charged orgy action! Four hunky studs are putting away a few beers while watching an auto race. Two super-hot sex scenes take place at once — in the bedroom the horniest hunk takes on two lovers in a row, while on the couch three other studs do it all!! These four hunky studs and their action really sizzle!!