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In this drama, two social scientists conduct research on the secrets of human sexuality. Given that they're working in America in the 1960s, their work is very controversial, and it provides lots of titillating potential for this Showtime series. Michael Sheen and Lizzie Caplan star.

Masters of Sex is a series that is currently running and has 4 seasons (46 episodes). The series first aired on September 29, 2013.

Masters of Sex is available for streaming on the website, both individual episodes and full seasons. You can also watch Masters of Sex on demand atAmazon, Vudu, Microsoft Movies & TV, Google Play, iTunes online.

Sunday 10:00 PM et/pt on Showtime
4 Seasons, 46 Episodes
September 29, 2013
Cast: Michael Sheen, Lizzy Caplan, Caitlin Fitzgerald, Teddy Sears, Nicholas D'Agosto
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Masters of Sex Full Episode Guide

  • In the season finale, Masters and Johnson labor to save the practice from crumbling in the face of insurrection within the clinic.

  • Masters and Johnson get back from Topeka, each struggling with the trip's ramifications. Art and Nancy seek to tie up loose ends in order to have a new beginning, and Libby proceeds on a road trip with Bram that alters her perspective.

  • Masters and Johnson travel and pose as a couple to examine practices at a competing center. While Bill and Virginia are off, Art, Nancy and Langham take advantage of their absence to persue their own agendas.

  • Masters looks to train Art as his protege in a new field of research as Johnson works hard to keep Nancy at arm's length. Betty looks to a surprising source for help in her fight for equal rights to Helen's infant.

  • Johnson tries to get her relationship with Masters back in line while Masters does his best to achieve satisfaction elsewhere. Betty and Helen prepare themselves for a new addition; Art and Nancy review the outcomes of their party.

  • Johnson and Masters' troubles come to a head as the trial begins with Keller leading the charge. Virginia does her best to revive their career as Bill faces the reality of what the charges could mean for him, Johnson and the practice.

  • Johnson, Masters, Libby and Keller wind up together at a party thrown by Art and Nancy. Pairings and perspectives shift as the night wears on, until the light of day exposes the consequences of the evening.

  • Masters and Johnson adjust to new partners, but their respective cases have them second-guessing the instinct to remain separated. A romantic prospect pushes Libby to embrace life as a newly single woman of the sexual revolution.

  • Masters and Johnson turn to new partners and focus on the expanding clinic.

  • In the season premiere, Masters and Johnson search for purpose without each other.

  • Masters, Johnson, Logan and his wife fail to agree over anything during dinner.

  • Johnson objects to Masters' program after both Nora and Lester have missteps in the protocol. Meanwhile, as Libby's birthday approaches the men in her life are aiming to please. Plus, Tessa explores what sex really means to her.

  • Under Johnson's analytical supervision, Masters proceeds with the surrogacy program.

  • Johnson goes to Sin City with Dan Logan. In her absence, Masters begins his surrogacy program.

  • The tables are turned when Masters and Johnson end up being interviewed by an exotic new patient.

  • Masters and Johnson work with a celebrity couple who would like to reinvent their sex life. Tessa is determined to have a better understanding of her mother.

  • Libby and Masters discover that Johnny has been bullied and want to find a solution to the problem.

  • Masters and Johnson decide to make the most of their newfound fame.

  • Masters' new patient is a prominent member of society. Virginia and Libby manage to come to an agreement.

  • Johnson and Masters are about to publish their study and release them from all the work they been involved with. They take time to reflect on where life has taken them all in the last year.

Masters of Sex News

Lizzy Caplan Just Got Married

The 'Masters of Sex' star tied the knot in a star-studded Italian ceremony over the weekend.

Watch the 'Masters of Sex' Season 2 Trailer

The new season of "Masters of Sex" is about six weeks away, so why not catch a sneak peek? Buzzfeed has released the first trailer for the show's second season, which premieres on Showtime in July. It is, as you might expect, pretty provocative. First of all, it looks like Bill and Virginia won't be apart for long. "We've participated in this study many times," says Michael Sheen's sex scientist Bill Masters in the trailer, "but at your apartment, something was.