If paying for sex is the oldest profession, the notion of bartering services for sex must surely be the first porn joke … and by now, the most overused cliché associated with the business. Pool guys, pizza delivery men and plumbers may come and go with the prevailing winds, but somehow each new generation thinks the brain-dead concept is fresh and funny - which accounts for the existence of the Butt Plumbers series.

So amused are the makers that they don't even realize that a [potentially] arousing sex scene's greatest enemy is the ongoing chatter of vapid ad libs uttered by performers who think they're being clever, if they're thinking at all. When the plumber groans "your asshole feels so good, it's so tight," the correct response of his customer should not be "Does that mean you'll be done sooner?" Nor, when the female moans "I love it in my ass," should the man say "I bet you love it almost as much as a free plumbing job." This sort of loquacious foolishness is known as pissing on the fire, which the Butt Plumbers do with alarming frequency.

Had the bun-breaching been anything to write home about, such nonsense might be forgivable, but the action appears as forced as the alleged jokes. Uncredited covergirl Rio provides the most enthusiastic rectal ride, which isn't saying too much.