"The One With The Boobies" is the thirteenth episode of the first season of Friends, which aired on January 19, 1995.
Chandler accidentally sees Rachel wandering around topless after her shower, an accident which makes Rachel distance herself from Chandler. The friends point out that the whole thing is an eye-for-an-eye situation which Chandler has to resolve by showing her his penis, which he refuses to do. Joey gets a visit from his dad, who is not planning to tell Joey of Ronni and an affair he's having with her. But Joey, after intercepting a telephone conversation he believes his dad was having with his mother, finds out everything. Ronni meets Joey on her way to meet his dad, but Joey does all he can to prevent anything from happening between the two. Joey's mother then shows up to confess how she knows of the affair, and she also admits to Joey that she's okay with it because Joey Sr. can treat her better and with more attention out of guilt. Joey can do nothing except make his peace with the whole thing, albeit grudgingly. His affection for his mother is too much to show the slightest inclination to support his dad.
Phoebe has a new boyfriend, a shrink named Roger, who, initially bemused by the wacky, quirky, goofy personalities of the friends, eventually antagonizes them by displaying his analytical ability to correctly guess unpleasant facts about their backgrounds and lives, even when he hasn't actually been asked to demonstrate it at all. Eventually realizing he is actually a rather unpleasant person who enjoys the power over other people given to him by his ability to do this, Phoebe breaks up with him. Chandler's peep on Rachel leads to a series of nudity eavesdrops during the episode - Rachel glimpses Joey, who walks in on Monica, who gets a glimpse of Joey's dad.