"Swingtown:" Has this ever happened to you? You're about to take a shower with three other people and then your uptight friends show up and say, "I don't suppose anyone took the time to wipe down the kitchen?"

Tonight's genre-busting transgressions on "Swingtown" include: Marijuana use, skinny-dipping, teen binge-drinking, breaking and entering (no, not what you're thinking; just a house), a student hot for teacher (an ongoing storyline) and endangering the passengers of an entire plane for a little nookie.

Plus, playing Twister while stoned.

Tonight's cold opening aspires to being hot: Tom (Grant Show) is piloting his plane, chattering away to the passengers about how he's about to take the Tokyo route, and a woman appears in the cockpit - it's his wife Trina (Lana Parrilla), which makes this mild for this show, but Tom snaps on the Auto-Pilot and they get busy.

Fly the friendly skies, indeed. They're putting the you-know-what in "cockpit." I got a million of 'em. No, actually, just those two - let's move on.

So Susan (Molly Parker) and Bruce (Jack Davenport) were planning a weekend getaway to their cabin with Roger (Josh Hopkins) and Janet (Miriam Shor), but this whole swinging thing has really come between them, so Janet cancels their weekend trip together because Roger feigns illness ("What do the four of us have in common, anyway?" he asks bitterly). On the spur of the moment Susan invites Tom and Trina to join them, and of course they do. But what about all that swinging that Bruce and Susan are still coming to terms with? "Let's not overthink it," Susan suggests.

Meanwhile, Bruce and Susan's daughter Laurie (Shanna Collins) is working on getting some action of her own, inviting her summer-school teacher to her place while her parents are gone. Son B.J. (Aaron Christian Howles), who's sweet on his neighbor Samantha (Britt Robertson), allows her to lead him astray, too. (All this swinging business may be harmless, but it certainly hasn't done wonders for the Millers' parenting skills.)

Up at the cabin, it's time for a little friskiness: The four are preparing to shower together (how big is that shower in that modest little cabin, anyway?) and, whattaya know, Janet and Roger had a change of heart and show up. Well, this is awkward, but not so awkward that Janet can't make it just a smidgen worse by asking/declaring: "I don't suppose anyone took the time to wipe down the kitchen."

See, and there's the difference between this show being on CBS and it being on, say, Showtime: Here, it's just a tease. On Showtime, they would've had that fourway-shower orgy and then Janet and Roger would've shown up and that would've been so much more awkward.

So it's adding up to a very awkward weekend, only Trina sprinkles some marijuana into Janet's brownie mix, which enlivens what becomes a downer of a dinner, with Tom and Trina/Roger and Janet bickering incessantly. So, nothing better to do while stoned than play Twister and giggle like idiots. But will Janet respect herself in the morning? Or is she on that slippery slope to swingerdom?

Kind of an average if not bad episode, even if the show's delayed gratification is definitely not in keeping with its '70s gestalt. But this continues the show's producers' trying to have it both ways - "Swingtown" wants to be taken seriously as some sort of sociological treatise even while it camps it up, a tightrope you'd think few would want to tread.

- "Swingtown:" 10 tonight (9 Central); CBS (Channel 2).