Changing It Up in the Bedroom Scott Gries/TLC From left, Chris, Rebecca, Hali, Loveless, Dana, Jeff and Misty of "Secret Sex Lives: Swingers." If you're watching a channel called Discovery Fit & Health and someone starts talking about "the lifestyle," you might assume the reference is to a triathlon training regimen or a vegan diet. Not on a new show the channel offers on Saturday. The lifestyle in question involves spouse swapping and other alternatives to monogamy. The show, a four-part reality series, is called "Secret Sex Lives: Swingers," and it looks at five couples who like to mix things up occasionally in the bedroom. And they could be that ordinary-looking couple next door. "The biggest misconception about the swinger lifestyle is that we're hooking up with other people day and night, or that I used to be a stripper or something," says Jaymee, who with her husband, Everett, does the swinging thing. Unlike Showtime's explicit "Polyamory," about polyamorous relationships, this series, at least from the premiere, does not appear as if it is going to have bare skin and soft-core sex. But there is plenty of discussion of sex. And there is a "Fit & Health" component of sorts after all, at least to Jaymee's story in the opening episode. Everett is pressuring her to say yes to a threesome, but she has just had a baby and says she isn't yet confident enough in her "body image" to resume their swinging ways.