His new roomie isnt excited about her boyfriend regulating every aspect of her life.
Sheldon cant believe Amy wont just roll over and accept her fate.
He and Penny work to convince Sheldon and Amy that they need to communicate better.

Credit: Sonja Flemming/CBS
Amy wants to store their toothbrushes in the same holder.
This request makes Sheldon want to see other people.
He assures Amy that the sexual creature within has awoken and he has an evolutionary drive that wont quit.
Ah biology, you saucy pervert.
Penny takes Sheldon for a drive to cool off.
All that heavy breathing and complaining about people at work can get annoying.
And why do Amy and Leonard have to eye Sheldon and Penny like they are pieces of meat?
Since when did appreciating the mind go out of style?
Meanwhile, Amy and Leonard have a similar conversation about their significant others.
Sheldon is the worst.
PS: Amy has never lived with anyone before and she starts with Sheldon?
Of course there needs to be a learning curve.
While the Hofstadters play therapist, Raj and Stuart bid Howard adieu at the comic book store.
He and Bernadette have plans to go to Palm Springs for a babymoon.
What they didnt plan on was morning sickness lasting well into the night.
Howard suggests they take a staycation and just chill at the house.
The others dont have to know.
All is well until Howard hears someone come into the house.
Since their phones are downstairs, they cant call the police.
He checks through the upstairs window to find Stuart bobbing in the foaming water like a boiled chicken breast.
Raj confesses to Stuart that he is single now.
Bernadette feels bad that they didnt know Rajs relationship status.
Howard shouts that the free loading is over to the surprise of his guests down below.
Who got him to stop using Purell on his pocket change?
Who got him to stop putting only gloves in the glove compartment?
Why would she walk out on Pinocchio before he becomes a real boy?
She cant stop working on him now!
Thats why he always knocks three times.
He locked eyes with his dad, ran to his room, and never spoke of it again.
Penny understands Sheldons hesitancy: Hes trying to save Amy from pain down the road.
Sheldon doesnt want to turn into his parents by bickering all the time.
Penny makes the suggestion that he try and fix the pain hes causing Amy now instead of the future.
He agrees and then apologizes for hurting Penny.
How could he look for other women without considering her?
Penny takes Sheldon back to Amy so he can make things right.
He decides to forgo the bathroom schedule and reiterates that he was never interested in seeing other women.
Call me crazy, but I teared up just like Penny.
Our boy is growing up so fast.
Theoretical LaughterSheldon:Look whos open to compromise.
The woman who married Leonard.Leonard:Hey.
The second and third knocks are to put your pants back on.