Fräulein Leather (1970)

Starts with this tattooed blonde and a brunette chick running around on a beach at night—looks like they’re just teasing at first, but it gets real quick. The dude, some average-looking guy in his 30s, drops to his knees and goes to town on the blonde on a carpeted floor. Camera’s right there, side angle, so you see everything—her legs shaking, him really digging in. Then they move to the couch, and he flips her over for doggy. The blonde’s got a tight little ass, and he pounds her hard enough to make the couch creak. Brunette’s watching the whole time, touching herself, then jumps in for a quick ride before the scene ends. Lighting’s dim but you still get a good look at the action—no shaky cam, just solid close-ups when it counts.