Polygamy? More sex in the house. You think liberals would love that.
And also that 19th century Lds polygamy resulted in about one child less per woman/Mormon mom than had she married a monogamist. (Liberals have been about less children to be born into the world, whether they npg them, zpg them, abort them, infanticide them, etc.)
Source: Indiana University Bloomington...see Polygamy = less children, not more [ignore their evolutionist clap-trap conclusions & just look @ the bare stats from their comparative study]