This is the view one gets with the autonomous self. However for the Christian, the above is all decidedly non-Christian.
For the Christian, the sexual relation
1.) Supports the community
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Once you redefine society with sex as a social construct, you end up with a dehumanized society in which there can be no biological Mother or Father or Son or Daughter or Husband or Wife. This means the family no longer has any stable intrinsic meaning or definition and without any stable meaning or definition the State will end up with the authority to “define” family. This gives the state unprecedented powers to micromanage the family.
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In Biblical thought, sexual relations can be used to either create and support a community or to destroy a community. This reminds us that any marriage that introduces a heterogeneous element into an otherwise homogeneous social order is an attack on that social order.