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In this post, the word “menage” refers to a sexual activity involving three people, not primarily to a long term love relationship. I take it as obvious that one’s participation in a sexual menage doesn’t tell us anything about whether that person believes in monogamy, polyamory, or is against the idea of romantic love totally.
I’ve read five erotic romances which feature a menage (or more): Victoria Janssen’s The Duchess, Her Maid, The Groom and Their Lover, Megan Hart’s Dirty, Broken, andTempted, and Maya Banks’s novella Overheard (all but the last are Harlequin Spice). In three cases, the menage involved one hetero woman and two hetero men, was the fulfillment of the heroine’s fantasy, and readers were led to believe it was a one off (ok, a three off). In Broken, the menage involved the hero and two female strippers. In each book, it was pretty clear that the protagonist would end up happily satisfied in the long term with just one person, and it was clear who that person was. In Dirty, the heroine had virtually no relationship with the second man. In Overheard, the heroine was friends with the second man. And in Tempted, the heroine had strong feelings for both of the men, but was married to one of them, with whom she stayed. Although Tempted takes us into a gray area, all of these books stay true to the RWA definition of romance —  the two person (primarily one woman, one man) love relationship.....http://readreactreview.com/2009/06/18/polyamory-menage-erotic-romance-and-culture/