Teenage girls are shown in their underwear some, especially in the second half of the film, but it is not sexual. It's mostly after their mental states start to deteriorate.

A girl asks another girl if she is on her period.

A girl briefly kisses another girl on the lips. It's more of a way of making fun of her than it is sexual.

A brief partial side view of a teenage girl's butt is shown when she squats to urinate. Another girl is later shown urinating. No nudity is shown, but we hear urine trickling into the toilet.

A girl tells the others that a man is watching them. She calls him a pervert and implies that he wants to rape them.

As they go insane, the girls start chanting about the man while dancing seductively in revealing clothes.

A painting shows a woman's bare butt. It is shown several times throughout the film, but it is not intended to be sexual.

A girl crushes up the leaves of a plant and rubs them on her skin. She then reaches down the front of her pants and rubs it on her genitals. There is no nudity, and it is very brief.

One girl carries around a doll for comfort. Any time someone takes it, she panics. Some of the other girls notice this and use it to bully her.

A girl is thrown against the wall. We hear a crunch, and when she turns around, her nose is bleeding. She is then taken off screen and possibly killed.

A group of girls chases another girl through the house with the intent of hurting and possibly killing her.

A girl hands out knives to all the others to use for defense against the man that may be watching them. Later on, as practice, a girl pretends to be the man and pins another girl down. She then pulls the girl up, and the entire group pretends like they are stabbing her. Some of them come very close to actually stabbing her.

As the girls go crazy and divide into groups, they yell at each other and scream and cry frequently. There is a lot of emotional violence and manipulation throughout the film.

A few S words (less than ten) and occasional mild profanity. EDIT: I assume this means 'shit', but it could mean 'slut' or 'slash' (slang for 'urinate'). It gets more complicated with 'b-word': bollocks, bastard, bitch, balls, bum, boobs, Beelzebub, ... Please list the language actually used in the film, or your contribution will assist nobody.

One of the teenage girls smokes occasionally throughout the film.

The girls drink wine or champagne in one scene.

When the girls start going crazy, they act almost intoxicated.

Insanity and the threat of rape are frequent themes throughout the film.

A group of teens is trapped in a house with no way out.

The girls roam through the house chanting. Unnerving background music throughout.