Because the government doesn't have an interest in "conjugality" within a marriage unless one of the people in the marriage brings the issue before a court. Polygamy and incest have both been addressed by the government. They have specifically created laws against polygamy and incest.<quoted text>
Pietro believes marriage is a union of husband and wife, and that said union should recognized, privileged, and soley legally maintained, as such. Same sex marriage is a contradiction in terms, marriage is a union of both sexes.
He is puzzled by SSM advocates who insist that conjugality is expendable, but monogamy is not. Perhaps the all powerful and wise Big D, or his sidekick Big Red, could explain this.
If you have a problem with that, then take it up with the courts.