British movie with a guy dating two girls at the same time together

This movie is probably from the 80s, maybe the 70s?  This 20-something guy knows two women about the same age, they all hang out together, have sex in his car, one woman at a time, the other gets out of the car while the other one has sex with him (very odd), then they switch.

All through the movie, each woman is trying to convince him why he needs to pick her instead of the other woman to stick with.

In the end he says he’s made up his mind, the women run upstairs to the bedroom and tell him that they want to both keep him, so he never does say who he picked…

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