Yes, we are made male and female. Yes, woman was made for man. Yes, the only acceptable way for those two to come together is marriage.

Yes, every mammalian species on the planet, and many other heterosexual species as well, display homosexual behavior; many as a social behavior, others as a response to overpopulation. Some even will mate homosexually for life, and may even 'adopt' young abandoned by their parents.

Just because both yin and yang exist doesn't mean that that is wrong for yang to join with yang. Especially if there is nothing specifically banning such a pairing.

In Christ,
~CSL