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"The Matrimonial Momentum" (S9E1), "The Opening Night Excitation" (S9E11) The season opens with Leonard and Penny in Vegas. The biggest event? Sheldon and Amy finally consummate their relationship on Amy’s birthday. It’s handled tastefully and hilariously.
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By this point, The Big Bang Theory was the #1 comedy on television. These seasons dealt with major life milestones: engagements, cohabitation, and vows.