A focal point for many of this season's episodes, Monica (Courteney Cox) and Chandler's (Matthew Perry) secret romance is revealed here. Ugly Naked Guy is moving out and Ross (David Schwimmer) wants his apartment. To gain an upper hand in a flurry of bids, Ross goes nude with him. Looking out their window, Joey notices that Ugly Naked Guy has a friend; a shocked Rachel (Jennifer Aniston) proclaims, "It's Naked Ross!" While checking out Ross' new apartment, Phoebe (Lisa Kudrow) looks out the window and sees Monica and Chandler having sex. Deciding to use the information to play jokes on them, Phoebe begins making passes at Chandler. This leads to a flirting showdown between the two where they kiss and freak each other out. Soon everyone knows about Monica and Chandler except Ross, who eventually sees them kiss out of his new apartment's window. This episode originally aired on February 11, 1999. ~ Rovi