1981:
Dad just bought a VCR, one of those big heavy cranky ones with only 2-heads and buttons bigger than your finger.
It costed $800-1100.
The thing was very loud when you press the buttons to stop, play, forward, rewind.
I remember telling a friend that we just got a VCR and he said he could get me porn movies.
So I gave him $50 and he got me 3 porn movies recorded on one single VHS tape:
Taboo 1 (1980)
https://www.imdb.com/title/tt0081593/
http://www.iafd.com/title.rme/title=...80/taboo-1.htm
https://en.wikipedia.org/wiki/Taboo_(1980_film)
Sexboat (1980)
https://www.imdb.com/title/tt0083055/
http://www.iafd.com/title.rme/title=...80/sexboat.htm
I remember watching Sex Boat and thought all the women in it (18 of them!!) were goddesses: they were mostly all Penthouse Pets.
"11" (1980)
https://www.imdb.com/title/tt0195506/
http://www.iafd.com/title.rme/title=11/year=1980/11.htm
$40 was a lot of money then but if you wanted to rent a movie at a video store, you had to leave $100 credit card deposit per movie and back in those day, not everyone had credit cards.
I didn't have one until after I got out of college.
If you wanted to buy any porn film on BETA or VHS, you had to pay as much as $100 for each one.
All those 3 ^^^ porn films are now classics and they are still available, even in 4K remastered Blu-Ray.