Actually, I agree with you. Also the way Cosby’s wife and the girl’s date leave them alone in the room together. Not enough details but sounds like ‘grooming’ among swinger circles.
In ‘67 she and her date would have to have been teenagers. Two teenagers swinging with an adult black couple? Sounds unlikely and/or criminal.
Interesting point since the Cosbys were good friends with actor Ossie Davis and his wife. Ossie admitted bveing swiinngers so many many years. Now I wonder if Bill and wifey were involved with them.