You can not come to any rational comparisons of same gender to opposite gender without completely disregarding pro-creation.
I disagree, under our legal system's principle of equal treatment under the law embodied in the 14th Amendment's Due Process and Equal Protection clauses of the Constitution, comparisons for equal treatment under the law are made on like situated groups. If a group feels that it is being wronged by the government, then under the 1st Amendment's grievance clause, an action can be brought against the government where the government then has a requirement to show a compelling government interest in the differentiation of actions.
In this case, like situated groups would be law abiding, non-related, tax paying, US Citizen, consenting, infertile, adults in a same-sex relationship as compared to law abiding, non-related, tax paying, US Citizen, consenting, infertile, adults in a different-sex relationship. One group (in most states) is allowed Civil Marriage while the other group is denied Civil Marriage. Even in the case where Same-sex Civil Marriage, the federal government then refuses (under DOMA) to recognize that Civil Marriage entered into under State Law. An unprecedented step taken by the Federal government which for over 200 years had recognized as valid all Civil Marriages that were legal under State law.
The laws pertaining to Civil Marriage in this country are silent on the couples fertility and/or the ability to procreate (which is one word BTW and not hyphenated). So ya there is a logical argument that procreation is not a requirement of Civil Marriage.
Basically it's saying that young pregnant women getting married is unimportant,
No it's not.
that a child having two parents (regardless of whether it "works out") is unimportant,
Which is an argument in support of Same-sex Civil Marriage and Same-sex Adoption. In states where those are illegal, the government is denying the child two parents because it prevents one member of the family unit of assuming that role of a parent (in a legal sense). In all states, a child born into a situation where the parents are legally Civilly Married - the participants in that Civil Marriage are by default the parents of that child (independent of gender of the spouses). When an adoption occurs, that individual becomes the parent of that child.
Such laws then prevent that family from having two parents.
and that child rights as according to the United Nations Convention on the Rights of the Child -is also unimportant.
http://www2.ohchr.org/english/law/pdf/crc.pdf
Above is the link to the UNCORC which you seem to hang your hat on.
There are numerous references throughout the document that refer to "parents", but not in one place does it refer to the gender of the parents.
If you are of the opinion that the UNCORC defines "parents" as (a) the egg/sperm donor, and/or (b) required to be of opposite genders - you are mistaken. Parents and legal guardians, as used in this document is a gender neutral concept and is fixed by the applicable laws of the country.
BTW - did you know that the United States is not a signatory of the UNCORC? My understanding is that the main opposition to the treaty comes from social conservatives that opposes the influence the treaty would have on United States sovereignty.
But yet you expect the same sympathy toward your relationships and rights or we are called all sorts of names.
I believe that all families should be treated equally under the law whether they be man + woman, man + man, woman + woman, man + woman + child(ren), man + man + child(ren), or woman + woman + child(ren). (Just for clarification, when I say "+child(ren)" that means Parent/Child and NOT sex partner relationship. I know most people would inherently recognize that from context, but someone would try to snip it out of context for an unintended meaning.)
Do you wish for equal treatment and respect under the law for all those family units (i.e. relationships) or do you want selected ones treated differently then other selected ones?
BTW - I can only speak for myself, but I don't get into name calling.
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