70s g/g porn was usually a scene within a movie. I'll mention the scene with Annette Haven & Constance Money in Anna Obsessed (1977?). Not that it was great, but they were 2 of the more attractive stars of the 70s & it was nicely shot.
80s is when the shot to video gg porn made it's appearance. Because it was shot on video, the quality is bad. Still, if you can find the early 80s Bruce Seven g/g movies he shot for 4-play (i think), you get a look at some of the earliest g/g porn movies made. As for an early 80s scene, check out the Pia Snow-Anna Ventura scene in Bad Girls (1981). Much like Anna Obsessed scene, nothing unusual, just 2 of the better looking women of that era. Good scene involving Barbara Dare-Ginger Lynn in Blame It On Ginger( mid 80s for Vivid). Throw in a favorite here, Sheets of San Francisco(1986) scene starring Erica Boyer & the delectable Candie Evans.
90s you have the Where The Boys Aren't series made by Vivid Video. These movies contain the biggest stars of the era as many of them were under contract to Vivid. If you like things a bit kinkier, you have the Buttslammers series from Bruce Seven. Felicia, one of the best g/g performers ever, was in some of earlier editions of this series. Throwing in another movie here, it's Snatched To The Future (1991) with a memorable scene featuring Sandra Scream & Angela Summers. Finally, I'll mention one of my favorite scenes. It's Janine Lindemulder & Jill Kelly in Broken Promises (1997).







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