- Sheldon and Amy go through a period of adjustment with their new living arrangement. Howard and Bernadette are forced to vacation at home when she falls ill and keep it a secret, unaware Raj and Stuart planned to use their hot tub.
- Sheldon and Amy are hitting obstacles in their five week cohabitation experiment, as Amy cannot put up with many of Sheldon's rigid rules, about which he will not negotiate. With their relationship on the line, Sheldon issues Amy with what he considers the ultimate threat, however unrealistic the threat may be. So Penny talks to Sheldon and Leonard talks to Amy in the Hofstadters' want for the relationship to work so that Sheldon will not move back in with them. While Leonard tries to counsel Amy from his perspective of the former roommate, Penny and Sheldon end up comparing notes. But both Penny and Leonard know their primary mission, which they may or may not be able to accomplish with their advice. Meanwhile, Howard and Bernadette have decided to take a short vacation to Palm Springs as their last getaway as a couple before the baby arrives. However with Bernadette suffering from morning sickness, Howard suggests they have a staycation instead. In the process, they discover some information about their friends while also discovering what happens around their house whenever they're not supposed to be there.—Huggo
- The new couple across the hall, Sheldon and Amy enter apartment 4A. Amy retorts that Sheldon can't control every aspect of their lives and that he has to be willing to compromise. Sheldon tells her to look at Penny who compromised and married Leonard Hofstadter. Leonard explains that she didn't compromise, she settled.
At the Comic Book Store, Howard and Raj are at the register buying comic books from Stuart. Howard says that he and Bernadette are heading out to Palm Springs for a quick vacation because Bernadette wants to do more things together before the baby comes.
Back in 4A, Leonard tells Sheldon that living together breeds conflict and that you have to learn to compromise. Amy suggests that for starters they keep their toothbrushes in the same holder. Sheldon then says that they should start to see other people. As a male, he has an evolutionary urge to spread his DNA as much as possible. Amy tells him to go see other people. Sheldon is worried that he might end up moving back in. Penny just wants to separate them for a while so they can cool down.
In Howard and Bernadette's bedroom, Howard asks her how she is feeling as she continues to throw up. Not so well. She is not well enough for a hot three-hour drive through the desert. So they decide to have a secret vacation at home without telling their friends.
Penny is driving Sheldon in her car. He is complaining that as much as they call him difficult to live with, he finds that Amy is even more challenging to live with. Amy breathes on him at night. Amy is always complaining about the people at work. When Sheldon steps out of the shower, she eyes him like a piece of meat. Leonard does the same thing to Penny and gives her a thumbs up.
Howard is rubbing Bernie's feet which feels great until he pulls a quarter out from between her toes. Then they hear the front door opening and they start panicking that someone is in the house. After locking the bedroom door, they realize that they don't have their cell phone with them. They hear a bubbling sound indicating that the hot tub is on. Looking out the window they see Stuart using it.
Leonard and Amy are discussing Sheldon in 4A. Leonard describes him as the worst; however Amy considers him high maintenance. Amy has never lived with anyone before and as Leonard adds, she is starting out with Sheldon Cooper. Amy adds that he posted a sign in the bathroom showing the number of days in a row that he didn't find one of her hair on the soap. Leonard's record was six.
Watching Stuart from their bedroom, Bernadette thinks that it is fun watching him float in their hot tub, not unlike having a fish tank. The back porch lights come on and out walks Raj in his swim trunks. Raj jumps in the seemingly empty hot tub, then Stuart pops up gasping for air. Stuart comes over whenever he thinks that the Wolowitzes aren't home.
Penny is still driving Sheldon around and now they are both complaining about their partners. Sheldon suggests that they stop for ice cream. Penny agrees. While at the ice cream parlor he can look for other women. Penny points out that he had a hard enough time with one woman. Sheldon retorts that being with Amy has awoken the sexual creature within.
Raj and Stuart are now having wine and they toast Howard and Bernadette and the house key they never asked him to return. Now Bernadette is mad at Howard for not getting it from Stuart. Stuart has no electricity since he hasn't paid his bill. Raj invites him to crash at his apartment since he has broken up with his girlfriends.
Amy and Leonard talking in 4A at the kitchen island. Leonard encourages Amy to hold firm on the bathroom schedule unlike he did. Amy thinks it is easier to give in. Leonard reminds her that she did get him to stop sanitizing his pocket change, putting things other than gloves in the car glove box (Mittens), and he got him to eat a turkey dog. She can't walk out on Pinocchio before he becomes a real boy.
While Penny and Sheldon are eating ice cream at the ice cream parlor, Penny suggests the girl behind the counter and the one eating strawberry ice cream, Sheldon's favorite. He rejects them. Penny asks him if Sheldon is really looking for someone else. Sheldon tells her that she is wise beyond her years, though at her age she is getting up there. Penny wants to know what the real story is. Sheldon begins a story that he has told no one. When he was 13, on a break from college (They ran out of math that they could teach him.), Sheldon returned home and found his father in his parents' bedroom having relations with another woman. That is why he knocks three times. The first is traditional and the other two get one time to get their pants on. What worries Sheldon is that he and Amy have been bickering like his parents did and he doesn't want to disappoint Amy down the road.
While enjoying the hot tub, Raj suggests that it is time to leave. Raj gets out, while Stuart doesn't since is not wearing shorts. Howard finally loses his temper and opens the window, yelling at them to buy their own hot tub.
Back in 4A, with Amy enjoying sitting in Sheldon's spot saying how nice it was and that she would start there standing up to Sheldon. Penny and Sheldon return from the ice cream parlor, and Amy quickly shifts to the center of the sofa. Sheldon apologizes for his earlier behavior and he is willing to forego the bathroom schedule. He was never interested in other women and to prove it he is willing to take their relationship to the next level.
Next in Penny's bathroom, Sheldon tells Amy, "Amy Farrah Fowler, will you share this toothbrush holder with me?" Amy would love to do that. They both put their toothbrushes into the holder and hug Amy looking very happy. Penny and Leonard are looking on.
Title reference: Raj and Stuart secretly using Howard and Bernadette's hot tub.
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