Soon their relationship progresses into a stronger friendship than before, while Sheldon and Penny's friendship slowly begins.In the season finale Penny hints at her true feelings for Leonard.

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However, almost immediately, Leslie and Sheldon argue over the validity of loop quantum gravity, which Leslie supports, and string theory, which Sheldon supports.

Leslie expects Leonard to back up her beliefs, but when Leonard backs up Sheldon, Leslie dumps him, much to Sheldon's relief.

Leslie agrees to date Leonard, assuming the dominant role before conceding that Leonard should assume the "male role".

With this new attitude, Leslie goes as far as evaluating Leonard's genetic defects, and talking about procreating with him.

Leonard is working on an experiment for several days, resulting in his inability to drive Sheldon to the university.

Sheldon asks Penny, Howard and Raj for assistance, but they all eject him from their vehicles for being annoying.

RUSH LIMBAUGH MARRIAGE ON THE ROCKS modestly whispers the National Enquirer headline on its miserable website. It seems Kathryn Rush is not taking too kindly to being snubbed and lambasted by everyone she’s ever met for being bound in holiest matrimony to a sweaty, loathsome, snorfling, terribly inelegant and not-nice! ) She’s furious at the 61-year-old con­servative firebrand and threatened to walk out of their marriage if he keeps up his trash talk, say insiders.

And insiders inside it say beloved bride Kathryn is ready to walk! person like Limbaugh, who of course apologized for “those two words” — slut and prostitute — but not the idea behind them, namely that every woman to come of age since Griswold v. […] Rush’s big mouth has caused a rift in his fourth mar­riage, and sources say he’s now running for cover from 35-year-old Kathryn, a Florida event plan­ner. “She feels as if she’s be­ing tarred and feathered with the same brush that people are using on her hus­band. “She said she’s become a social pariah because of his hot-headed, heedless comments and warned him in no uncertain terms that he’d better keep his trap shut and stop using words like ‘slut’ for any woman!

Penny dumps Eric after unsuccessfully using him to make Leonard jealous.

Sheldon explains to Penny that he feels uncomfortable with Leonard dating his arch enemy, Leslie, but approves the relationship after Penny's advice.

The night ends with Penny denying being Raj's girlfriend, and leaving after he becomes sick from over drinking.