Early 70s drive-in porn

Even though I was a teenager in the 70s, and quite active in appreciation of pop culture, I'm amazed as I go through the newspaper ads of the era how much porn was playing in Columbus, or perhaps I should say "porn," as most of the hard-R and X-rated films of the time were actually what was called "soft-core," typically with lots of nudity and simulated sex, not the clinically detailed close-ups of real sex that became accepted later in the decade. This triple bill of hard-R films played Columbus in December of 1973, at (presumably heated) drive-ins. "Unclaimed girls"? "Super-chicks"? A kiss away from jail? The mind reels. Probably these movie could play practically uncut on Cinemax or HBO today.