Captain Lust (1977)

The scene starts with Eliza Grant, Hunny, and Ruby Tuesday, all white girls in their 20s with dark short hair, lying down in a possible BDSM setting. Then, they appear with two pirate-costumed guys, one black and one white, both with short hair, engaging in intimate activities outdoor. The main action happens when two white guys with short dark hair fuck in a dim indoor room, one on top of the other. The girls also engage in oral sex with the guys. The camera captures wide shots and close-ups of the performers.