"Both Ray Donovan and Masters of Sex are quintessentially Showtime: bold, provocative, premium television with production values at the top of the food chain," Showtime President David Nevins said in a statement. "These acclaimed shows are filled with complex and interesting characters and settings that will no doubt give audiences compelling television to invest in for seasons to come."
Masters of Sex stars Lizzy Caplan and Michael Sheen as real-life sex researchers Virginia Johnson and William Masters, and follows the pair as their working relationship evolves into a personal affair.
The crime drama Ray Donovan stars Liev Schreiber as the titlular character, a "fixer" who works for a powerful law firm in Los Angeles.
Ray Donovan and Masters of Sex air Sunday nights on Showtime.
(Full disclosure: TVGuide.com is owned by CBS, Showtime's parent company.)
Watch This Tonight — See why Wahlburgers is our editors' pick: