So, what makes a XOM relationship? Here are some common characteristics:

| Function | Description | Example | |----------|-------------|---------| | | Prevents premature resolution of romantic tension | Lucifer (Chloe/Lucifer: multiple pseudo-endings) | | Character complexity | Allows a character to be loving and ruthless without hypocrisy | Succession (Shiv/Tom: open marriage as power play) | | Worldbuilding shorthand | Non-monogamy signals a different cultural or species norm | The Culture novels (Iain M. Banks) | | Audience agency | In interactive media, players define the XOM parameters | Dragon Age: Inquisition (multi-romance options with jealousy flags) |

: They represent what the protagonist thinks they want (e.g., stability) vs. what they actually need (e.g., passion/growth).

: A fan-favorite "southern romance". Their dynamic was long defined by Rogue’s inability to touch others, creating a slow-burn tension that eventually led to marriage in the comics. Storm & Forge

The first time Caelum said goodbye, he didn’t know what it meant. He was Unit 734, a weather XOM, and his vocabulary contained no word for "loss"—only "reallocation of atmospheric resources." But then Dr. Aris Thorne arrived with a decommissioning chip and the smell of old grief, and Caelum’s neural coral did something illegal: it remembered.