<P> On the spur of the moment in "The Recombination Hypothesis", Leonard asks Penny out on a date after he imagines what getting back with her might be like . Their real date ends successfully and they agree to take their relationship slow in "The Beta Test Initiation ." During their renewed relationship Penny has dismissed comments about him ever leaving or dumping her or about worrying about his unfaithfulness around other women and strippers as in the episode "The Stag Convergence". After Penny suggested having sex in "The Launch Acceleration", Leonard breaks the mood by proposing to her accidentally . They later meet and Penny does have the courage to tell him "no" and not break up with him as she did two years previously when he told her that he loved her . However, their relationship is still obviously strained . In season 5, Leonard and Penny watch Howard being launched into space while holding hands to comfort each other . With the start of season 6, he wants a reluctant Penny to define their relationship in "The Date Night Variable". </P> <P> Penny finally does admit her love to Leonard, in "The 43 Peculiarity". Penny and Leonard awkwardly stare at each other before running off in opposite directions . Leonard, though, is buoyed by optimism over Penny's admission . Alex Jensen asks Leonard out to dinner in "The Egg Salad Equivalency", which boosts Leonard's ego because two beautiful women are interested in him, however, Alex's interest makes Penny insecure . After another dispute with Sheldon, Leonard tries to move in with Penny in "The Spoiler Alert Segmentation", however she is not ready . During their Valentine's Day dinner in "The Tangible Affection Proof", Leonard again tries to propose to Penny and she cuts him off quickly . She admits that she is very happy with him, but she also admits to commitment issues and the thought of being married forever really "freaks" her out . Leonard then tells her that when she is ready to get married, she can propose to him . In the season finale, Leonard leaves for an overseas job for four months and Penny is confident enough in their relationship to wait for him . In "The Gorilla Dissolution", Leonard and Penny become engaged . Throughout season 8, a running gag is their reluctance to decide upon a wedding date . In the season 8 finale, Penny asks Leonard to marry her that night in Las Vegas . Leonard happily accepts, but during the journey, after Penny expresses happiness that they will get married while knowing everything about each other, Leonard confesses to having shared a drunken kiss with another woman while on the boat in Europe, though he adds that the woman started it and he rejected her . Penny becomes hurt by the revelation, and even though she claims to forgive Leonard, there is clearly tension between them, leaving the season ending in a cliffhanger as to whether or not they will go through with the wedding . </P> <P> At the beginning of season 9, Leonard and Penny marry, although not without some initial problems . They both reveal that they were subconsciously trying to sabotage their relationship, feeling unworthy of the other . Leonard, concerned that he was trying to sabotage his relationship with Penny, meets with the woman he kissed on the boat . She barely remembers the incident and quickly grows bored with Leonard's ramblings, taking a sarcastic and dismissive tone toward him . From that meeting Leonard comes to terms with his insecurities and he and Penny are able to become more comfortable in dealing with their mutual fears about their relationship . Leonard seriously tries to move into Penny's apartment though Sheldon has serious objections and makes them compromise to spend multiple nights a week in Leonard's old room . Early in season 10, the couple is very happy to be finally living alone after Sheldon moves in with Amy . </P>

When do leonard and penny move in together
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