That section seems to have been added without any supporting citation by an anonymous user on 1 November 2019. Given France was a Catholic country in which polygamy was illegal at that time, I'd say it looks like simple vandalism of the Wikipedia page.
The Council of Trent in 1563, expressly opposed polygamy and concubinage:
If any one saith, that it is ...
They may have had in mind the "right of the first night"
Droit du seigneur.
It does not really matter whether this "right" really existed or not and how frequently it was practiced. But it was used in pre-revolutionary propaganda against the old regime as the comedy by Beaumarchais " La Folle journée ou Le Mariage de Figaro" (1778) shows.