The hofstadters are so excited about finally having a place of their own that they put on music (which sheldon would never let them do) and have a private dance party in their underwear.
This is due to penny having a change of heart at the last minute after feeling sorry for sheldon who was having a hard time dealing with his breakup with amy and leonard moving out.
It works until amy and sheldon find them together after they think that penny is cheating on leonard.
Reluctantly, both ask sheldon to prepare them a relationship agreement like his and amy especially since he and amy appear to be so happy living together.
"the table polarization", the gang wants to add a dining room table to apartment 4a which sheldon objects to.
Penny and sheldon dating in real life
Later sheldon gives them a wedding present - a trip to san francisco for the three of them.
"the closure alternative",penny was concerned about the passion leonard showed for science, comics books, and various television shows while she had no passion in her life.
"it was such a huge part of my life and no one knew about it.
Howard spent his time with the couple when raj started working for sheldon to keep his visa valid ("the pirate solution"), raj spent his night with them when leonard wanted to talk to penny about their issues ("the date night variable") and he also interrupted their one-night stand ("the love car displacement"), and sheldon puts himself into their relationship constantly, even going so far as to behaving like he was their child, and worming his way into their marriage after his breakup with amy ("the separation oscillation", "the 2003 approximation"), or calling their relationship "our marriage".
During that time, the two stars began their secret relationship, just as their characters on the show also began dating.
Did penny and sheldon dating in real life
"the spoiler alert segmentation", leonard suggests that he move in with penny after he again gets exasperated (again) with sheldon.
Penny reminds him that they could have a wonderful life if she becomes rich and famous.
"the separation oscillation", leonard has a nightmare that penny got even with him by making out with sheldon.
After realizing how weird the relationship was, they decide to return to being friends, but quickly resumed their romance within a few seconds.
He mentions alex's actions to sheldon who tries to talk to her about it and landsthe whole gangin the human resources administrator's office.
Leonard wants him to come home, but penny convinces him that he should letsheldon go.
After a quick trip to texas to bring sheldon home, the new couple finally consummated their relationship which they both described as weird.
"the space probe disintegration", leonard tells sheldon that his attitude is why he and penny are not living together.
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"the big bear precipitation", sheldon spills the secret about leonard's bank account, making penny angry.
Sheldon was often frustrated with the constant presence of penny within his inner circle and the couple many times were treating him like they were his parents.
: first i want to say that its not sheldons fault, he tried very hard to keep your secret, if howard hadn't drugged him he would have taken it to his grave.
When leonard starts dating raj's sister, penny breaks down in tears, proving that she is not over him.
The bachelor's nick viall celebrates being in montreal with fiancee vanessa grimaldi with a big romantic airport kiss.
"the first pitch insufficiency", they go on a double-date with shamy where sheldon is bragging about their relationship is so much better than theirs.
During a blackout at the apartment, leonard opted to hang out with penny at her apartment and the two were about to make out when sheldon interrupted them.
Penny gets leonard to pick out a dining set that she likes and gets leonard to stand up more against sheldon.
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"the cohabitation experimentation", sheldon and amy move into penny's apartment for a five-week cohabitation experiment after amy's apartment suffers a plumbing problem.
Penny appears devastated when her friends inform her that the wedding was real and she is mrs.
When amy confronts penny since she can't move in with sheldon, leonard overhears the conversation.
Kaley Cuoco, who portrays Penny on the show, recently revealed to CBS Watch Magazine that she and co-star John Galecki once dated.
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However, he insists that she keep the money since the car was a gift, and that he really doesn't need it.
The actress' big bang theory character, penny, has been arguing with her on-screen husband leonard (johnny galecki) while, in real life, cuoco has decided to end her 21-month marriage with husband ryan sweeting.