If you had enough motivation, you could learn to decode the picture by squinting, and understand the audio by enough exposure. That came very handy to many a teenager on late Saturday evenings.
Still supposedly, the hardest part was finding the strainer in the kitchen without waking everyone in the house.
And the saddest part was discovering that it didn't work.
GP is referring to Canal+ who'd play that one weekly porn movie on saturday evening.
Us kids from the eighties could watch like 30 seconds unencrypted, than the scrambling would start.
We'd still watch the movie ; )
As an Anglophone it counts as taking a 1-credit foreign language class.
Only with a major scene change (eg day to night) this would need retuning. And this type of content didn't really do that, as most of these movies take place in the same bedroom :) so it was not a bad way to watch it.