Hi Supmop, do you mean actual sex and covered by the mosaic? According to the book it was in the mid 80's (not sure if it was 1984 or 1985)when Nikkatsu developed the "Roman X" films.
yes I mean actual sex covered by mosaic
so the first AV company in Japan was Nikkatsu ?
and I guess the uncenssored JAV started around early 90's ?