Season 6, Episode 23 - "Love for Sale"
Despite a previous awful experience, Dorothy reluctantly agrees to participate in the bachelorette auction for the children's hospital charity. To Dorothy's embarrassment and dismay, who arrives and outbids everyone to be her date?
Stan
Rose: Alright, now let's start the bidding at $5!
Male Bidder: $5.
Stan: $100.
Dorothy: Stanley, what are you doing here?
Stan: Buying a date with the woman I love.
Dorothy: Oh, jeez. Not in front of people.