Well any aspect of the human experience is fair game. Not having seen this I couldn't tell you whether it's in good taste (whatever that would mean in this case). Someone like Hitchcock was known for artful ellipsis in depicting various depravities but when he finally got free of the old Production Code he produced one of the most explicit rape scenes ever put on film at the time (Frenzy).
IMHO, later Hitchcock, including "Frenzy" (1972) seems very cold-blooded. Always strongly disliked that film. No sympathy for any characters in that one.
"Two Women" (1960 - Vittorio De Sica) depicts the rape of a 13-year old girl and her mother in WWII Italy. Harrowing. Much more so than "Frenzy".
It was shown on Boston TV in the mid-'60s, back when broadcast codes were pretty strict, several years before Hitchcock made his film.