The One After the Superbowl, part 2 - S2-E13
Trivia: In The One With The Superbowl Part 2 the gang are down at the movie set of Marcel's film. Joey asks Phoebe to walk with him so he can show off his acting skills to the director. If you look closely you can see that the 'director' and the people surrounding him are the actual producers of Friends - Kevin S. Bright, Marta Kauffman and David Crane.
The One After the Superbowl, part 2 - S2-E13
Trivia: A big plot line in this episode is Ross going to visit Marcel. Take a look at the restaurant names on the menu where they eat dinner: the restaurant is called "Marcel's."
The One After the Superbowl, part 2 - S2-E13
Trivia: The young female crew member who Joey hopes can get him cast in Jean Claude Van Damme's movie is played by Lisa Roberts, sister to Julia Roberts, who is a guest star on this episode.
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