Straight couples don't have to be monogamous to be married or married to be monogamous. Monogamy no more defines marriage than the presence of children does. Monogamy isn't compulsory and its absence doesn't invalidate a marriage. ↗
That would be Axelroot all over, to turn up with an extra wife or two claiming that's how they do it here. Maybe he's been in Africa so long he's forgotten that we Christians have our own system of marriage, and it's called Monotony. ↗