From the outside at least, the actress Mo’Nique and her husband of 11 years, Sidney Hicks, would seem to be in the middle of a rocky marriage. Both have had sexual relationships with other partners for years — and continue to do so. And each is well aware of the other’s escapades.

But, the couple insist, the relationship is actually quite stable and they are quite happy. In fact, it has been a decade since Mo’Nique revealed in an Essence magazine article that she and Mr. Hicks, an actor and producer, were in an open marriage.

Now they have begun a podcast that plays on their unusual partnership. In “Mo’Nique and Sidney’s Open Relationship,” which is on Play.It, the CBS podcast network, the couple explains how the so-called polyamorous lifestyle works for them.

The open-marriage concept has been around for a long time, but some marital experts (though not all) say that couples interested in reaching a golden anniversary, or maybe even a first one, should be wary of following the example of Mo’Nique and Mr. Hicks, who are both 48.