When does Masters of Sex return?

The series premiered on September 29, 2013, on Showtime. It was loosely based on Thomas Maier's biography Masters of Sex. Set in the 1950s through the late 1960s, the series tells the story of William Masters and Virginia Johnson. The series was canceled by Showtime on November 30, 2016, after four seasons.
The series explores the research and the relationship between William Masters and Virginia Johnson, two pioneering researchers of human sexuality at Washington University in St. Louis, Missouri. In real life, Masters and Johnson each have two children, but in the series, they have three children each.