- When Amy must vacate her apartment for repairs, living arrangements are made with Leonard, Sheldon, and Penny. Howard and Bernadette don't want to know the sex of their baby, but Raj finds out.
- A burst water pipe leaves Amy's apartment uninhabitable for five weeks. Penny and Leonard offer Leonard's bedroom as a place to stay for that time, while Penny and Leonard would stay in Penny's apartment, effectively meaning that Amy and Sheldon would be living together. However after speaking to Sheldon about the matter, the collective decide that Penny and Leonard will stay in Leonard and Sheldon's apartment, while Sheldon and Amy will move into Penny's apartment, and treat it as a five week science experiment - Penny's apartment being the control away from Sheldon's comforts - to see if he would like to live with Amy after the five weeks is over. The experiment would allow him to evaluate the situation from a scientific perspective, seeing what worked and what didn't. As they will be sharing a bed, Amy and Sheldon decide to take coitus off the table to remove sexual tension as an evaluating factor. But the sex or lack thereof may be just one of many issues which could kibosh the experiment much sooner than the five weeks. However long, Leonard and Penny are determined to make the most of their Sheldon-free time. Meanwhile, Raj has been a constant presence at Bernadette and Howard's visits to the OB/GYN. The latest appointment includes the ultrasound, the sex of the baby which Bernadette and Howard have decided they don't want to know until the birth. However, Raj discovers the baby's sex. After getting over their anger at Raj knowing but they not, Bernadette and Howard reevaluate their decision in not knowing the baby's sex in light of Raj knowing.—Huggo
- Amy, Leonard and Penny enter the lobby with that night's take-out food as Amy describes the plumbing problem in her apartment. A pipe broke over her clothes closet destroying all her clothes and her apartment will be uninhabitable for five weeks. Penny suggests that she stay in Leonard's bedroom while the Hofstadters stay across the hall. Technically Amy would be moving in with her boyfriend while Penny gets to live "alone" with her husband.
While setting up dinner, Sheldon comments that cohabitation is a lot to process. Penny reminds him that it is only for five weeks and that they'll be right across the hall. Amy proposes it to him as a scientist to collect data about their compatibility. Like Star Trek, Leonard compares it to Sheldon's own five-week mission. Now that is what Sheldon considers as sexy talk. Next Sheldon is worried that he might find it being comfortable with Amy because he was in a familiar environment. They need a neutral ground. Penny tells them to move in across the hall. Finally Sheldon accepts the five-week mission as Amy grabs and hugs him happily.
Howard, Bernadette and Raj enter the kitchen as Raj tells them how happy he is with their OB/GYN. Howard complains that he doesn't have to come to every appointment. Bernadette does not like him describing her textbook cervix. The parents look lovingly at the blob on the sonogram photograph and jokingly call the baby Blobert, Bloberta or Blobbi. Raj casually says that he knows the gender of the baby, horrifying Howard and Bernadette, as they don't want him to know at all.
Sheldon and Penny are sharing a drink in apartment 4B with Penny telling Sheldon how proud she is of his decision. Sheldon then asks Penny for advice about living together and Penny tells him to be willing to compromise, do little things for her and respect Amy's space. Amy is seeking advice from Leonard. She can't leave any belts on the floor (They look like snakes), keep M&M's in her pocket for long waits in lines and no photo-flash photography.
Sheldon is packing his underwear as Amy wants to discuss the sleeping arrangements. Sheldon is excited, concerned and scared, just like when he goes on Space Mountain. Amy realizes on the subject of coital expectations, she knows that he is way out of his comfort zone. She proposes that they take sex off the table until they get more comfortable living together.
In the hallway, Sheldon has his clothes in a laundry basket and Amy has her suitcase as Penny gives them the keys to their apartment. Amy is ready to go while Sheldon keeps giving Leonard chore reminders (one of which he wrote on Penny's right palm). They say their final farewells and then Sheldon and Amy are in the apartment alone officially living together. Sheldon declares that the experiment has begun. Penny and Leonard can be heard yelling, "WE DID IT!"
Later, while Amy is unpacking, Sheldon wonders which side of the bed she wants. They argue about who should pick and Amy insists that Sheldon do it. The left is closer to the door for exit in case of emergency, but is closer to the entrance in case of attack. The other side is closer to the window, but perverts could be watching him while he slept. Amy then closed the drapes as a solution. That solves the problem until Sheldon wonders about someone standing behind the drapes.
Howard is coming to bed while Bernadette remarks that it is ridiculous that everyone else knows the sex of the baby including the doctor, the sonogram technician, and Raj.
Amy is getting ready for bed, making noises from the bathroom. Sheldon makes a sour face from those noises and then moves over to the side of the bed away from the bathroom. Amy notices his move and Sheldon remarks that she should be glad he was still in the room. Sheldon wants to build a wall of pillows between them. Amy shoots his idea down. Sheldon says that he is very sensitive to heat and that her bottom should have iguanas lying next to it.
Over to Apartment 4A, Leonard looks at his wristwatch declaring that it is Sheldon's bedtime and he is in for the night. Penny is ecstatic to have the apartment all to themselves and asks what he wants to do and he takes his jacket off. Leonard replies that since Sheldon is not there, they are going to put on some music and dance in their underwear. Penny just wants to have sex. Leonard tells her that that is inevitable after she sees him dancing. She does not look convinced as he pulls down his pants and gets rocking.
Howard throws down a magazine and says that he is calling Raj which excites Bernadette. Then Bernadette has second thoughts. Raj is asleep with Cinnamon and picks up the phone just as Howard hangs up.
Penny eventually caved in and is seen dancing with Leonard. Sheldon is now snoring and Amy can't get any sleep. Next Penny is comforting Leonard who exerted himself from doing the worm and is now on his asthma inhaler. Raj gets another call and hears Bernadette shouting to hang up.
Amy is now spooning with Sheldon looking very happy. Sheldon keeps moving toward her side of the bed and then pushes her onto the floor. Sheldon wakes up and wonders what she is doing on the floor. Amy takes out her phone, takes a flash picture of him and he runs away.
Next morning Amy and Penny are having coffee and everyone's tired. Amy complains that she got very little sleep. Penny smiles at her and tells her "Yeah, get it, girl". Amy says that it's not what she thinks. Leonard joins them complaining that he pulled something. Penny quips that it's really not what Amy thinks. Sheldon enters (without knocking) telling them about his good night's sleep. Amy exclaims that she was on the floor all night and that maybe living together was a bad idea. Sheldon argues that she is a scientist and should stick with the experiment. Then they agree that for science they should continue the experiment. Their argument about science turned each other on. Penny jokingly comments on how their "new neighbors" are weird.
Title reference: Sheldon and Amy agree to experiment with living together.
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