Pornfidelity 

1. unfaithfulness in marriage or relationship caused by the act of wife bringing home ass for the husband / boyfriend; threesomes, orgies. 2. belief of person or persons that marriage is not monogamous, boring or repetative.

My girl picked up a chick at the mall, brought her home and we had a threesome! That's Pornfidelity!

There is a website for an example. Wish your girl had that mindstate?

Pornfidelity by Dahlan August 28, 2010

PolyFidelity

A relationship structure of 3 or more individuals who have no sexual or loving connections outside the group. This group may be open or closed to new additions, but there is no sexual or loving connections with the new addition until added.

PolyFidelity is a subset of PolyAmory. The Kerista commune of San Francisco used the term extensively in the early 1980's and may have used it from their inception.

PolyFidelity by Ronald A. King March 28, 2005

Porn fidelity 

A vow taken by a pornstar, that when she gets married, she will only do porn scenes with her hubby, usually a male pornstar too, and not with another dude.

"While Jenna Jameson was married to Justin Sterling, she never fucked another guy in front of the camera"

"Dude! That what I would call porn fidelity"

Porn fidelity by Rosifaulds September 11, 2009

polyfidelity

A group in which all partners are primary to all other partners and sexual fidelity is to the group. More primary partners can be added with the entire group's consent. Coined by the Kerista Commune.

The polyfidelity group in which everyone is equal and will decide to allow a new member together.

polyfidelity by physco219 March 23, 2007

Polyfidelity

Like polygamy but you don't have to be married.

I'm with Sandy and Anna. But it's not infidelity it's polyfidelity.

Polyfidelity by Red Leviathan September 20, 2017