Relax... It's Just Sex (1998)

A mixed group of individuals - lesbian, gays, and heterosexuals who all frequent a local bar struggle to accept each others lifestyles. However when the two gays are attacked and fight back and ultimately rape one of their attackers, the group becomes strongly divided on their actions. Jennifer Tilly is the mother hen of the group who tries to hold everyone together. The lesbian lovers break up when one admits to having an affair with a man. imdb