Producer Stacy Shane and ManUnderdog Prods. have optioned “The Sex King,” a new play by Bill C. Davis (“Mass Appeal”), with an eye toward mounting a production next season.Shane, with his ManUnderdog Prods., is one of the lead producers of “The Temperamentals,” which last month began an open-ended commercial run Off Broadway following two successful limited engagements last year. Two-hander “Sex King” follows a man on trial for running a Connecticut prostitution ring and the female reporter to whom he chooses to give an exclusive interview. A reading of “Sex King” is planned for this spring ahead of the potential production next season. No casting or director has yet been confirmed.