There are many frank and for the most part clinical discussions of sex and human sexuality throughout the movie. We see a slide of an erect penis entering a vagina along with a discussion of the condition of the female sex organ. We see disjointed images of a man caressing a woman's bare breast, a man kissing a woman's nipple, a man performing oral sex on a woman, and two men and a woman having sex. A younger man asks an older woman in front of her husband if she will have sex with him; the woman says she would like that, and then we see them in bed kissing (he is nude with his bare back and buttocks visible and she is in a nightgown) and it is implied that they have had sex. A man waits in a bed for his wife to join him, she climbs in wearing a low-cut nightgown (revealing cleavage and bare shoulders), they kiss, he caresses her breast, he rolls on top of her, they kiss, they both moan, he thrusts and few times and she screams in pain, asking him to stop. A man caresses an older man's face tenderly, kisses him, and then they kiss passionately. Several men stand in a room, a woman enters, and we see her nude (bare breasts) on a bed masturbating (moving rhythmically) while a man discusses what she is doing; then we see her having sex with a man (he is on top of her thrusting rhythmically). A man masturbates in front of two men (we see him unzip his pants and see his arm moving rhythmically) and yells when he reaches climax. A young man masturbates in his bed; we see his hand moving rhythmically under a sheet and hear him moan when he reaches climax. A man talks about having been introduced to sex as a boy by his grandmother, having had sex with his father, animals and family members. Also, a man talks about having had sex with farm animals. A man talks about having sex with pre-adolescent boys and girls. A man undresses in front of another man (we see his penis and bare buttocks). A man talks about observing and filming women in various stages of sexual arousal. A man and a woman visit a doctor to determine why they appear to be sexually incompatible and there is a frank discussion about the size of the man's endowment and a part of the female anatomy (the discussion includes a sketch and a ruler). A man asks a married couple to talk about their sexual techniques including descriptions of positions, oral sex, foreplay, other forms of stimulation, etc. Two young women ask their mother and father about matters of sex at the dinner table. We hear many people asking questions about myths and misconceptions about sexuality and sex acts. Many people talk about their first sexual experience. Men and women dance together (we see a young woman's underwear when her skirt flips up). A woman talks about having had an affair with another woman. A young man confesses to a friend that he has ejaculated in his sleep and it seems that this is a continuing occurrence. Two men are shown bare-chested and a woman wears a bathing suit top and shorts (revealing cleavage, bare abdomen and bare shoulders). We see a man discussing sketches and sculptures identified as pornography, with nude men and women in various sexual positions, in various stages of undress, and with sexual paraphernalia (people in bondage, a woman with a whip held over a man, etc.). We see photographs of fully nude women and a statue of a phallus in a suitcase. A man on a pulpit preaches to men and women about roadside brothels, sexuality, degrading picture shows, pillow talk, zippers and how they all lead to free sex. A man talks to a class of young men and young women about controlling sexual urges. Many people are shown while undergoing sex interviews that involve intimate questions about their sex lives. Several people are shown being taught how to conduct interviews about sex. Many animals are shown mounting each other and thrusting. A man and a woman kiss in many scenes. A man kisses a woman's neck (she's not his wife).