So now you shift from 'natural' to 'only', which further proves you are naturally stupid and only full of BS.<quoted text>
You said marriage was the "only" natural building block of society. I simply disagreed. Because there are many building blocks of society. Marriage is but one, and it has changed numerous times over the years regarding ceremony and recognition by various entities including church and state.
Your head lives in your food exit. That much is obvious. Otherwise you wouldn't be posting half the idiotic BS you seem to thrive upon. It is the fundamental building block of your personality. Which is quite tedious.
You tried to insinuate that gay couples are a building block. Now you try again. Just a heads up, gay couples are never a building block within their relationship.
Procreation is limited to heterosexual couples. That core element of marriage has never changed. In every culture throughout human history, the constraint of marriage has been the natural and best setting for human fruit. All other options are considered default settings. Most often by the mother, father and children.
Funny you should troll attack with ass assertions. Anal sex is inherently harmful, unhealthy and demeaning. That's not my head up there...