I Love You, You're Perfect, Now Change An intrepid group of local producers is trying to make a long-run go of this sketch-y evening that chronicles, spoofs and sometimes even satirizes mating rituals from the first date to the final farewell. They just might pull it off, because as staged with verve by St. Louis theater veteran Bobby Miller this musical revue is rambunctious, breezy and just ribald enough to keep viewers chortling from beginning to end. An ideally suited ensemble (Michael Jokerst, Alan Knoll, Chopper Leifheit, Lee Anne Mathews, Laurie McConnell, Rosemary Watts) cavorts through a fast-paced evening of mostly humorous skits that allow everyone a chance to shine. Sitting through the show is like chewing a wad of bubble gum: after a few hours it begins to lose its flavor. But the sheer act of watching so many people have so much fun both onstage and in the audience bespeaks success. Performed through September 30 at the Playhouse at Westport Plaza, 635 Westport Plaza (second level), Page Avenue and I-270, Maryland Heights. Tickets are $41 to $46. Call 314-469-7529.