The Shower Scene, everything about that is graphic, not gore graphic but graphic none the less though.How so? You see no graphic content.
I know it got an "R" but I don't know when it got an "R". I would guess this occurred prior to the existence of "PG-13".
I see nothing in "Psycho" that warrants more than "PG-13" - and honestly, it barely warrants that rating...
Psycho was given an R back in the 80's when the ratings changed with the addition of PG-13.