Paul Mazursky's 1969 classic puts two couples and their relationships under the unforgiving lens of society's microscope in this unflinching examination of marriage. After one liberal group therapy session, Bob (Robert Culp) and his wife, Carol (Natalie Wood), are convinced they're open-minded enough to embrace a no-guilt approach to fidelity. But can they convince their best friends, Ted (Elliott Gould) and Alice (Dyan Cannon), to do the same?