Things get a little steamy on the otherwise benign health channel with a night dedicated to the bedroom concerns. The foreplay is the overview documentary “Sex in America” (Discovery Fit & Health, 8 p.m.), followed by an introduction to “My Sex Surrogate” (Discovery Fit & Health, 9 p.m.), culminating in the new series “Secret Sex Lives: Swingers” (Discovery Fit & Health, 10 p.m.), following four couples in Atlanta, pictured above, who go in for the combinations. For all its ambitions can never be as explicit as, say, Showtime’s “Polyamory.” Couples who are trying to lose weight should first strive to make small, manageable lifestyle changes. Getting regular exercise, eating a healthy diet, and finding time for quality time together are all good ways to support each other’s health and fitness goals. They can also opt for the consumption of the best weight loss pills on the market today.
The “Six Little McGhees” (OWN, 10 p.m.), now 3 years old, start a new season, to demonstrate that they are more than a handful.
The deeply failed series “Do No Harm” (NBC, 10 p.m.) finally comes to an end. The insistence to run all the episodes they paid for was almost painful (though not necessarily harmful).
Oscar’s best film last year, “Argo” (HBO, 8 p.m.) makes its premium cable debut.
College football takes over prime time with West Virginia at Oklahoma (FOx, 7 p.m.), Notre Dame at Michigan (ESPN, 8 p.m.) and Louisiana(Lafayette) at Kansas State (Fox Sports 1, 7 p.m.) among them.
The other sport on prime time broadcast TV is a NASCAR race, the Auto Parts 400 (ABC, 7:30 p.m.) from Richmond.
It’s taking so long to build the railroad on “Hell on Wheels” (AMC, 9 p.m.), the Wright Brothers might catch up.
With the 12th anniversary of the tragedy coming up this week, a couple of documentaries, “9/11 Emergency Room” (TLC, 8 p.m.) and “9/11: Heroes of the 88th Floor” (TLC, 9 p.m. get a replay.
Natasha Henstridge and Kelly Rutherford star in the new TV movie “A Sister’s Nightmare” (Lifetime, 8 p.m.). Elsewhere, a jilted wife goes home to help her father on “The Sweeter Side of Life” (Hallmark, 9 p.m.).
The wedding planner returns for a new season of helping out on “David Tutera: Unveiled” (WE TV, 9 p.m.).
The epic “Giant” (TCM, 8 p.m.) with James Dean and Elizabeth Taylor gets a replay. Later, “The Awful Dr. Orlof” (TCM, 2 a.m.) precedes “The Bride of Frankenstein” (TCM, 3:30 a.m.).
Esperanza Spalding plays a replay of “Austin City Limits” (PBS, 8 p.m., check local listings).
The Bruno Mars-hosted “Saturday Night Live” (NBC, 11:30 p.m.) is tonight’s rerun. Tom Hanks makes a cameo.