Cowardly Girls Squad (1988)

Three girls from the Cowardly Girls Squad (what kind of sense is that!) show off some slightly abnormal sex. That said, it was back then, so you might think it's nothing too extreme...but then you see them fumbling around trying to figure out the mechanism of female ejaculation, moaning as they're fingered for ages, a strap-on (which doesn't get much use), and, from a modern perspective, there's nothing strange about it, but for some reason, it's a really exciting and intense sex scene for both the men and women. It's an irresistibly funny film because, contrary to the cleverness of the girls themselves, it all comes across as so bizarre.