Crown Center, the Country Club Plaza, the Nelson-Atkins Museum of Art, the Crossroads District, Union Station and the River Market are all locales that could provide great settings for a movie.

Apparently filmmaker John Stewart Muller thinks so, too. The KC native chose to shoot his first feature film, “Fling”, in his hometown. Thankfully, he makes good use of the region’s visual attributes.

A very adult ensemble drama, “Fling” focuses on the pitfalls of the new morality of a new millennium. Are open relationships really such a good idea?

Brandon Routh, who made quite an impression in 2006 in the title role in “Superman Returns”, leads a large cast in this risqué but well produced drama that tiptoes through the minefield of contemporary relationships.

Routh plays James, a successful professional approaching his 30th birthday. While attending a wedding ceremony, he hooks up with a former flame named Samantha, played by Courtney Ford (Routh’s real-life wife).

After their sexual encounter, James discovers to his dismay that Sam is still in a relationship with her live-in boyfriend Mason, played by Steve Sandvoss (“Kiss the Bride”).

The idea of this “open relationship” doesn’t sit well with James. He’s been carrying the torch for Sam for years and feels very awkward with the situation.

Sam doesn’t believe in marriage and Mason doesn’t want kids. In fact, while Sam was hooking up with James at the wedding, Mason was making moves on his best friend’s little sister, Olivia (Shoshanna Bush).

But Mason can’t quite bring himself to admit that he’d like to marry Sam. He’s not crazy about their open relationship and is actually jealous. His brief encounters with young girls like Olivia are simply his reaction to Sam’s sexual activities.

For James’ part, he doesn’t like the circumstances either, but he’s so smitten with Sam that he’ll accept the situation for the time being.

Naturally, tensions eventually come to the surface as all of these characters attempt to reconcile their desires with their personal ethics.

While Muller opts against graphic nudity, his script, co-written by Laura Boersma, is strictly for adults only. The movie has yet to receive an MPAA rating, but it easily earns an “R” for its raunchy dialogue and frank sexual subject matter.

The cast members were apparently chosen for their good looks but, thankfully, they handle their roles admirably giving the movie a big boost.

While flawed, “Fling” demonstrates that Muller has a lot of possibilities. So does KC. (No MPAA rating) Rating: ***

* Avoid at all costs
** Only if you're bored
*** Good movie
**** Well worth your time
***** Be sure to see it