RAISED IN CAPTIVITY, Circle Theatre. If Nicky Silver had written a play about a gay man trying to overcome the numbness that’s afflicted him for the 11 years since his lover died, he might have given the American theater a compelling story. Of course, that would require the hard work of creating a believable, psychologically complex world. So instead Silver creates one human being–Sebastian, a gay man living through “emotional and sexual celibacy”–and surrounds him with grossly overwritten cartoons: a wacky, self-loathing psychologist who pokes out her eyes in an act of penance and becomes a wandering religious zealot; a wacky, self-loathing sister who sings “This Could Be the Start of Something Big” at their mother’s funeral; and her wacky, self-loathing husband, who abandons his dentistry practice, barricades himself in the house, and becomes a full-time painter–but uses only white paint so he “won’t screw up....