Many of this movie's scenes depict full nudity. All of this leads to sexual activity sooner or later within that scene. To the extent that there is casual or innocent nudity in this movie, it is brief, proceeding to sex or masturbation.
No external part of the human body is hidden in this movie. This includes clearly erect penises and exposed labia. (The latter despite the fact that none of the women in this movie shave their pubic areas, typical of a mid-1970s movie.)
This movie explicitly depicts many types of sex acts including breast squeezing, fellatio, cunnilingus, male and female masturbation, labia rubbing, vaginal fingering, and penile-vaginal intercourse.
Most of the movie's sex scenes involve couples only, mostly heterosexual. There is one lesbian couples sex scene. There is one masturbation scene. There is a small orgy in which one grouping is F-M-F.
A man receives fellatio from a woman while driving a van.
Explicit ejaculation onto a woman's body is shown multiple times, separately onto face, breasts and/or belly.