Random Scene-Does anyone know the name of this movie?

Hi,

Hope someone can help? This was just a single segment of a movie. I wanted to see the whole film but a transformer blew and power was out for about 4 hours. To start off, I cant remember the genre: possibly comedy, possibly suspense, possibly drama.

It's a scene with two relatively young couples. Couple #2 is a guest at the house of Couple #1. The wife of couple #2 is an actress and while it doesn't seem she is a really high profile actress, let's just say..she does some small commercials and the like. Either the husband or the wife (or both) of couple #1 says to the wife of couple #2 while they are all seated in the living room: "Hey ------- so how did the commercial go? Do you think it's going to aire?" (or some other such question). The wife of couple #2 says "Yes". Then couple #1 says "so tell us about the scene in the commercial? What did you do?" and the wife of couple #2 grabs a drinking class full of soda-pop of the wife of couple #1 and she then says "Is this diet soda?" and the wife of couple #1(who owns the house and is the host) says "yeah" and then the wife of couple #2 says "It figures" and everyone laughs. Then the actress(wife of couple #2) demonstrates what she did in the commercial. Everyone is looking and she grabs the glass and slowly and erotically licks along the side of the glass like she is simulating licking an erect p-nis/c-ck. Then she says "Mmmmm. Taayyyyst-eeeeeeee(Tasty)" and the couple #1 claps and cheers. But the funny thing about it is: Both couples(and especially the actress) are sort of oblivious and unaware to the fact that the acting scene was either a porno movie or sexually suggestive.(to them it was just another TV scene). Yes---they are all that oblivious! ha-ha. Does anyone know what movie this is?