A man and a woman stranded on a desert island — the setup for stories and punch lines for decades, if not centuries — has inspired the series “Man, Woman, Wild” (8 p.m., Discovery), now in its second season.

Like just about everybody on a show like this, he’s a former Special Forces survival expert. She’s a fetching journalist described as “sassy.” Together they’re Mykel and Ruth, the married couple who take “Let’s Get Lost” to new extremes.

In the season opener, “Lost at Sea,” their rented boat breaks down in the area near the Bahamas roughly known as the Bermuda Triangle. (Why don’t they call it the Bahamas Triangle? Just wondering.) Stranded in the middle of nowhere with nobody to help them (unless you count the dozens of folks on hand filming these proceedings), they show off all of the handy survival techniques you’ll need if you actually drive your off-road vehicle a tad too far off the road.

Need a drink? Solar stills and raisins will turn salt water into drinkable fresh water. In a later episode, we discover another source of potable water, but it’s not for the squeamish. After all, what’s a urine cocktail between married adults?

When Mykel gets extremely ill from seasickness, Ruth takes desperate measures, improvising an enema for her husband hundreds of miles from land.

Wow, this makes eating bugs and snakes so routine. So “Survivor” year 2000. So passe. This all leads to the critical question: Is this the first prime-time enema? Or just the first TV enema accompanied by witty banter between married professionals?

• Syfy kicks off its Labor Day weekend of marathons with 12 hours of “Star Trek: The Next Generation” (7 a.m. to 7 p.m.), featuring episodes chosen by fans. Other early marathons include 11 consecutive helpings of “Criminal Minds” (4 p.m. to 3 a.m., A&E). There are six servings of “Diners, Drive-ins and Dives” (6 to 9 p.m., Food). Four episodes of “Two and a Half Men” (5 to 7 p.m., FX) are just a warm-up for the 12-hour “Men” marathon airing Sunday.

Tonight’s other highlights

Note: Listings may be affected by local coverage of baseball or preseason NFL games.

• On two episodes of “Friends With Benefits” (NBC): Sarah misses superficial compliments when she starts dating a blind man (7 p.m.), a return to the exes (7:30 p.m.).

• A corpse on a rooftop sparks an investigation on “CSI: NY” (8 p.m., CBS).

• Warbling worthies compete on “Karaoke Battle USA” (8 p.m., ABC).

• A mega church requires a mega fish tank on “Tanked” (8 p.m., Animal Planet).

• “Hard Knocks: A Decade of NFL Training Camps” (8 p.m., HBO) anticipates the football season with a glance back.

• A warehouse stores a monster rodent on “Rat Busters NYC” (9 p.m., Animal Planet).

• It’s hard to tell friend from foe on “Haven” (9 p.m., Syfy).

• A devil’s bargain on “Torchwood” (9 p.m., Starz).