I completely agree. Nowadays, porn is just a succession of predetermined standard positions, just acrobatics without real passion. Those days they obviously enjoyed it. As an example, they started with real kissing in this scene. They really looked like a horny couple.
I love these older scenes. It seems like they are really fucking, not just thrusting as fast a possible. They do it in realistic positions without the gymnastics, and you can see the dicks penetrating the pussies. It is so hot to me.
They used that very same set & her dress for another scene, when he cums while spooning & he pastes her pubic hair in goo, then she says: "I'm gonna suck the cum right outta your cock".