I agree with most of what he says in the article but he can’t resist a dig at same-sex marriage. These aren’t the same issue.
Same-sex marriage takes nothing away from traditional marriages.
Husbands and wives are no less married for the existence of husband and husband or wife and wife marriages.
Marriage is a legal institution. If the definition of marriage is extended to same sex couples then they are indeed married.
Sex is a matter of biology, not law. Changing the law can’t change the underlying biology.