Physically this is indisputable; as one moves through the physical to the mental and spiritual, it becomes easier to hide and mislead on this basic fact, but couples themselves know better. In fact, sex is often enough the result of couples who catch each other’s attention for other reasons. In situations where the physical is the primary motive, these other motives for spending time together frequently arise; those couples without these other bonds nearly always dissolve. Sex also frequently leads to couples preferring each other to anyone else, and both expecting and promising exclusivity a thing that could not happen if the physical bond were the only one to consider, since there are always times where one or both partner is unavailable sexually. Also, sexual attraction naturally leads to people pairing off in as beneficial a match to themselves as they can arrange: not necessarily where the greatest sensual delights lie, either. Nor is satisfaction in a lover’s relationship exclusively gauged by those couples as the greatest degree of physical sensation. And it all leads to family units that people are willing to defend to the death against all comers. A happy home is something worth protecting, and not surprisingly people will speak up about and oppose proposals destructive to that happiness whether the family or the proposal are liberal or conservative. People with families to protect unite across political and social strata to do it.
Of course, there are those who resist the very idea of progressing to the spiritual:
This is a major protection from all the other nonsense peddled as alternatives to healthy and fully-realized humanity. Society can hardly be remade along statist or Marxist lines with that sort of thing going on. Thus the major thing to do is to destroy families … a tricky proposition.
Then again, if you’ve promised your heart to the state, at least you’ll have a chance to be faithful: no one worth having will stand in your way.