The Young Starlets (1972/76)

This one’s got Eliza Grant, Hunny, and Ruby Tuesday all together in one scene. They start out with some intimate contact, the three of them getting cozy on the bed. Eliza, a blonde with long hair and a slim build, takes center stage at one point, getting fucked by one of the guys while the other watches. The brunette, curvy girl with a tattoo on her arm is also getting some action, taking turns with one of the guys in what looks like doggy style. The third girl, a dark-haired, petite one, is mostly just observing but does get some screen time. It’s pretty straightforward, no-nonsense threesome action with decent camera angles.