If your couples section needs filler, here ya go.
Oh, there is treachery afoot in the Army. A soldier gone wrong is running about having sex with other soldier's wives, right under their noses. Sadly though, what could be a somewhat hot premise is totally undone by the bad lighting, lack of color correction (so all the performers look completely unattractive and jaundiced), strange editing and totally uninspiring sex.
We start with a hard-working Army man, finally getting a day off to spend with his lovely wife. As they start getting frisky, however, Soldier Boy gets a phone call from The Chief, telling him that he has to get to work right away to find the wayward soldier. He sends his wife out to the backyard to catch some sun and calls over a couple of comrades (well, a comrade and his girlfriend, who is new to the Army). They quickly get to work on solving their problem by stripping the girlfriend and getting her to demonstrate her newfound Army skills (who knew that you learned how to suck cocks and get d.p.'d in the Army?) while the Wayward Soldier has his way with The Wife in the back yard.
It would have been somewhat cool to switch back and forth between these scenes if they were hot, but these (and all the sex here) seem largely uninspired. The director tries this "two scenes at once" trick later in the movie (a girl/girl/boy on a pool table, and Soldier Boy drowning his sorrows in a barmaid), and it doesn't really work then either.