Pam brings home a man she just met named Len to have sex, but they have to use the living room. Harry, Pam’s dad, makes several passes in and out of the room, interrupting them every time. Pam takes her dad’s appearances in stride, and at one point Len and Pam suggestively offer him some candy. When Harry finally leaves for work, Pam begins to undress Len.
Len and Pam are in a rowboat together and we learn that Len has moved into Pam's house as a boarder. During their conversation, Pam admits that her parents haven’t spoken to each other for years and that she once had a brother but he was killed by a bomb during the war. Fred, the boat manager, shouts sexually suggestive jokes toward the couple and it becomes obvious that Pam is attracted to him.
Pete, Barry, Mike, and Colin meet up in the park. Pete is dressed nicely for the funeral of a boy he intentionally ran over, Barry is teased mercilessly by the others and when Len arrives he is recognized by Colin from their school days. Mary, Pam’s mom, appears carrying groceries, and as Len helps her out, the boys make sexually crude jokes.
Back in the living room, Mary is placing food on the table. While Len eats, Harry sleeps in a chair. Wearing just a slip, Pam comes in to put on makeup and tries to get the TV to work, but nobody can figure out how to adjust it. Throughout the scene, a baby cries off-stage continually and no one, including Pam, its mother, goes to check on it.
Pam has been dumped by Fred, the father of her baby, and is sick in bed, with Len making an attempt to take care of her. When he brings in the baby, Pam ignores it.
Back in the park Fred and Len are fishing and chatting. Len has lost his job because he’s spent so much time caring for Pam. Pam arrives with the baby, which she has drugged with aspirin in order to stop it from crying. After Fred rejects her, Pam storms out of the park in anger, leaving the baby behind. Len follows. The other guys start to wander in one at a time and amid more sexual joking, they start punching the baby and violently pushing the carriage. Fred then joins in the "fun" and they begin throwing rocks at the baby until it dies. After they leave, Pam comes back and wheels the carriage away without bothering to look inside.
Fred is in jail whining to Pam about how he was victimized by a crowd of angry wives upon being brought to the jail. Pam is not angry at Fred even though Fred casts blame upon her for having a baby in the first place. He also suggests that a group of hooligans killed the baby. Len shows up with cigarettes for Fred, and after Pam leaves, Len informs Fred that he was a witness to the entire event.
Harry is in the living room ironing and talking with Len about his new job. Pam comes in to dry her hair and the scene devolves into more domestic bickering.
Len is cleaning his shoes when Mary enters the living room wearing only a slip. She is preparing to head to the movies with a friend. After letting Len know she doesn’t mind if he brings sexual partners up to his room, she gets a tear in her stocking and has Len sew it back together while it is still on her leg. Harry enters, looks at Len and Mary, clearly flirting, and leaves.
In a café, Len and Pam wait for Fred, who has just been released from jail. Pam attempts to lose Len, but he won't leave. Fred and the other baby-murderers arrive with a girl named Liz, Fred's new girlfriend. Pam tries to lure Fred back to her, but receives only humiliation. The talk revolves around what prison and killing a baby feels like.
It’s tea time in the living room. Mary pours Harry’s tea onto the floor which results in an argument in which Mary lays claim to most of the objects in the house and Harry accuses his wife of having sex with Len. Mary responds by breaking the teapot over Harry’s head. Pam eventually blames all her problems on Len and Len responds by agreeing to leave the house once and for all.
Len has his ear to the floor eavesdropping on Pam, who is in the room below. Harry enters with a bandage on his head. Len promises he never had an affair with Mary, and Harry tells him not to leave the house. He then tells Len that he is planning on leaving soon himself.
In the living room, Mary is clearing plates from the dining table and Len is repairing a chair. Pam is reading a magazine and Harry is filling out a football coupon. Len asks Pam to get a hammer, but she ignores him. Everyone continues doing what they are doing in silence.