For the sake of clarity, re: hard and soft core versions
My recollection (and it is pretty fuzzy, since it was the 60s after all), is that X-rated at the time (late 60s) is comparable to softcore porn now. So the original shooting did not include genitals and copulation.
Then, a very few years later, the industry standard changed and so body parts were added from totally different actors and actresses.
I remember seeing the new, improved x-rated version in the 70s and they actually gave credit to body doubles.