My suggestions for the effective inclusion of nudity in movies are:
- Shame: Michael Fassbender;
- Women in love: Oliver Reed, Alan Bates;
- The man who would be King: SeanConnery;
- Maurice: James Willy, Rupert Graves;
- A room with a view: Rupert Graves, Julian Sands;
- American werewolf in London: David Naughton;
- God's own country: Josh O'Connor, Alex Secareanu
- American Gigolo: Richard Gere.
Tom and Lola depicts nudity in a very natural way.
According to a summary on Clothesfree:
A pair of young children who have been living in bubbles in a hospital room dream of going to Alaska where they feel they will be cured from their mysterious disease. Nude scenes in virtually the whole movie, as these two children live in their bubbles naked.
There's also the 1994 film War of the Buttons. Two rivalling groups of kids claim their conquests' buttons as trophies of their victories. So one group decides to show up to one battle completely nude.
I am flabbergasted that the shower scene from Psycho is being held up as a non sensational or pornographic example of nudism in film. First, Hitchcock is known for his hyspersexualized female leads. Secondly, this is a horror film. The genre requires that women who are sexually impure be killed for their sins. This is what is happening in this very scene. Further, the non melodic score by Bernard Hermann is a direct cue to what is happening: stylized sexual violence. If it was nudity in the narrative, it would be diagetic scoring. This is non-diagetic to push the scene out of the film into something else: a conceit of women's liberation as seen through the eyes of Hitch. This is his anti-beatnik anti liberal anti women statement. It was also the most graphic scene ever filmed and past the censors. The shower curtain mimics the soft focus of the vaseline lens. I can't see how this is normalized but it is iconic.
Prospero's Books https://www.imdb.com/title/tt0102722/
It's a fantastical reinterpretation of "The Tempest." Most of the actors are nude at some point; and the extras are nude almost the entire movie. The story goes that the extras were actually recruited from nudist resorts. Hence the natural nudity throughout the movie.
This is not the Tom Hanks movie. It's about a couple that gets voluntarily stranded on a desert island. They are both nude throughout the movie, which makes sense on a desert island. It is based on the book by Lucy Irvine:
Naked Fear https://www.imdb.com/title/tt0943326/
A man kidnaps unsuspecting women, drugs and disrobes them, and then hunts them. An actually very powerful performance by the actress, who not only is nude most of the movie, but still conveys the emotion and vulnerability of someone who is not only naked in the open, but is also being hunted.
Silent films tend to have a few, the best I can think of is the bathing scene in The Big Parade, where the main character is horrified the french girl sees some of the soldiers bathing, but she really doesn't think it's that big a deal. The other if from the first half of Die Nibelungen, where the hero is seen bathing in the blood of the dragon he slew, and is used to show that he has one point of his body that was untouched by the blood, and is vulnerable to attack (he also tells everyone this apparently. No wonder he dies...not saying spoilers here since the movie is almost 100 years old).
For more modern tastes, I can't think of many. For what it's worth, Caligula does feature a lot of non-sexualized, historically accurate nudity at times (notable example being the road workers near the beginning of the film), and it seems the original planned version might been more in line with this way of thinking before it was reshot and butchered.
Also, any movie that has nude witches since it's not only pretty accurate but it's never really an overtly sexual thing. In fact, in the movie The vvitch the witches are downright terrifying until the end, where they just come off as being very free beings who, even if they do bad things, I feel it wasn't a bad ending to the film.