Howard brings his girlfriend over to Leonard and Sheldon's apartment unannounced, but Leonard quickly remarks "the more the merrier." Sheldon alludes to the point that they may be at their optimal level because more does not equal merrier, implying that diminishing returns exists.
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Sheldon was told by the university that he needs to take a sexual harassment seminar online.
Raj is upset about being along on Valentine's Day. Howard, however, is happy with his girlfriend.
