“You, Me & Her” is an indie rom-com about a couple exploring a threesome with the hope it will improve their marriage, and this Valentine’s Day, if you buy two tickets to the film through Fandango, you can bring a third person free. What you do after the movie is totally up to you.

Real-life married couple Selina Ringel, the film’s star, writer, and producer, and her director husband Dan Levy Dagerman hope the Fandango promotion helps improve their relationship with exhibitors. If not, they’ve got 19 other unique ways to get word out about their film — all brand partnerships, and all set up personally by Ringel and Dagerman.

“You, Me & Her” isn’t being released by a studio, it’s self-distributed via the married couple’s own production company, Two Hands Productions. Not only did they independently secure an opening in more 200 U.S. theaters, they...