The One In Barbados, part 1 - S9-E23
Trivia: When Joey and Rachel are looking for nametags to con their way into the convention, the name picked out for Rachel is Kate Miller. I just found it a bit odd that not a flicker of recognition passes across Joey's face, considering that was the name of Dina Meyer's character from a few seasons back who he was in love with.
The One With Ross's Inappropriate Song - S9-E7
Trivia: The joke in this episode, broadcast in 2002, about Richard having a tape of him having sex with Monica, Chandler watching the tape, and then Monica coming in and being furious that he hadn't noticed it wasn't her, plus getting annoyed about being taped over by Richard, is IDENTICAL to one in an episode of Coupling (UK version), broadcast in 2000.
Answer: The statements that she's contradicting (that it is common, it happens to every guy, and it's not a big deal), are the things that a woman commonly says to a man who is suffering from erectile difficulty, typically to assuage his bruised ego. However, most men do not believe that these statements are true, as evidenced by Chandler's outburst. He's so caught up in the proof that women are lying about it that he gives himself away.
Rooster of Doom