Dharma & Greg (1997)

S3E19 The Best Laid Plans

Dharma feels a wave of sadness about her intimate life for the first time when she realizes that Greg relies on his day planner to initiate romance. At the same time, a downcast Greg turns to Pete for support, who mistakenly suggests that the decline in their physical connection must mean that Dharma is involved with another man. This miscommunication sets off a chain of misunderstandings that threatens their relationship.