Why would anyone think that a lifestyle arrangement that stifled the production of new life had a any evolutionary role? It is a genetic dead end and thus socially inert.
Every time I see a child I am reminded
of the mockery of marriage in same-sex marriage, and the falsity of the
claim to marriage 'equality'. Every child is a clear demonstration of
the very inequality between a couple than can procreate and one that can
only make a mess of the sheets.
There is no public policy benefit in
attempting to solve the 'acceptance' problem of adults who opt to be
different, act different or live different from those of us who make the
next generation that pays all our bills in retirement (through taxes,
investment and consumption).