When I was 18 I jerked off to so many of these 8mm loops back in the seventies. I would shoot my load when the black guy came in the young teen white mouth. If I missed the moment I would have to feed more quarters til it came around again. And if some horny guy shoved his dick through the hole in the cloth partition separating the stalls I would suck him off then continue jerking. Those were the days.
Very labor intensive and could be costly but it was a labor of love (lust). But you could find 8mm gems like Jewel Shepard of Hollywood Hot Tubs and Christina fame with the jiggly puffy torpedoes doing hardcore. Just search her name under videos you will see Mike Horner enjoying her perky tits and sweet face. In the comments there is a detailed biography.