Paul Bettany is headed to cable. The Legion actor has been set as the lead in Showtime’s new pilot Masters of Sex. The series will revolve around sexual education researchers William Masters and Virginia Johnson. THR reports that Bettany will play Masters in his first foray into series television. Masters and Johnson pioneered human sexual response research, as well as the diagnosis and treatment of sexual disorders and functions. The two met in 1957, marrying years later in 1971. Their research continued up through the 1990s, until their divorce all but ended their professional partnership.