I'm not a porn person at all… but I remember getting my hands on this back in the 1990's and really loving the first 10-15 min. It's funny - the exterior shot of the house at the opening - which is actually the Forest Lawn Cemetery over in North Hollywood - is something I drive by almost every day (gives me a chuckle). I believe the movie was primarily shot in San Fernando (no big surprise there).
Although the 1995 version had a much higher budget, better actors and way better effects - I still despise the goofy take on it which takes me out of the movie every time.
This 1990 version was my first introduction to a more dramatic opening TF moment that led into the new female experimenting with actually having sex for the first time. Which was a bit of a "whoa" moment for me. But it's pretty obvious it just turns into a straight porn production where all the cast knows all too well what position to be in and what to do (which is not what would have happened for a first time woman having sex).
I didn't see the 1970's porn version til after this one - which was much more serious in tone. But to this day my favorite is ]still Dr. Jekyll & Sister Hyde from Hammer Films back in 1971. I've tried to contact them a number of times and asked to write/direct a remake of it for them - when Hammer decided to start remaking some of their older movies. Never panned out
MM