A line marriage is a form of group marriage where spouses of both sexes are added continuously along the line. This makes the marriage limitless as long as the last spouses in the line choose to take on new husbands and wives. A line marriage is form of polyamory that exists only in fiction.
The lack of sociological evidence of line marriage does not mean it does not exist in real life. Social and sexual relations are complexities that make most everything possible, including line marriage. Of course, there is still a prevailing stigma when it comes to all forms of polyamory. Should there be real life line marriage partners, it is unlikely that they will come out of their closets any time soon.
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