Vatican City, Nov 25, 2025 / 06:00 am

A new Vatican document defends marriage as a monogamous relationship amid the growing popularity of polyamory, and addresses the pastoral challenges caused by conversion to Catholicism of people in polygamous situations.

“One Flesh: In Praise of Monogamy” was published in Italian by the Dicastery for the Doctrine of the Faith on Nov. 25.

“Polygamy, adultery, or polyamory are based on the illusion that the intensity of the relationship can be found in the succession of partners,” the Vatican says.

To illustrate this metaphorically, the text cites the myth of Don Juan, an unbridled seducer whose womanizing leads him to hell, which demonstrates that “multiplying partners in a supposed total union means fragmenting the meaning of marital love.”

The t

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