Need title please

I remember two women and a man sitting at what seemed to be a restaurant, and the one woman was sitting opposite her boyfriend, from what I could remember. The boyfriend was sitting next to his girlfriend's (best) friend. The two sitting next to each other are joking around, or talking about the girlfriend in a good manner, and suddenly the girlfriend says "why don't you sleep with each other, and get it over with"? The boyfriend had no intention cheating on his girlfriend, and same goes for the best friend. The boyfriend and best friend looked shocked.

That's all I remember. I think it's a romantic comedy. I could be wrong. Judith Hoag might have been the girlfriend, but I cannot fully recall.

Thanks for any help.