Implied casual sex. Crude sexual dialogue. Frequent sexual dialogue.
Two couples are heard about to have sex (in adjoining rooms). The girls come out into the hallway to ask each other if they have a condom. Then they go look for condoms and end up only finding one. The "loser" ends up pregnant and gives birth off-screen.
A couple has sex in a common living room. She is shown in a bra and pants. They are overheard on a baby monitor.