Eugene discovers that his girlfriend, a girl with Down's Syndrome named Anna, is being used to make porno tapes. Her pedophilic father gets her to act childish and dress in children's clothing, hides a camera in her bedroom and films her having sex with the random strange men he brings home for her. Although she doesn't seem to realize that this is wrong and that if she didn't want to do it they are technically raping her, she does know what sex is and is more experienced than Eugene. That being said, Eugene and Anna are never shown having sex together although they do sleep in the same bed and Eugene is shirtless while Anna is in a bra and underwear.
Anna dances with Eugene with no pants on.
Eugene tells a Japanese story about a man and a woman who have sex under a rainbow.
Elvis Grimes, a former British punk rocker who Eugene meets, dresses in women's clothing (he is a closeted transvestite and it is implied that his own mother kicked him out of the house at a young age). He makes lewd remarks about women. Eugene asks him if he has "had it cut off". Elvis teaches Eugene how to slow-dance.
A mentally challenged boy at a group home tells Eugene that he is a "fag" who is probably having "buttsex" with another boy.
Some sexual phrases are frequently used, like "dick", "buttsex", "sex", "make love", "fag", "ass" and "fucking".