There is an inherent complementarity between an man and a woman. We do not speak of a man and a woman commisurating to perform respiration, one with lungs and one with a diaphragm. We do not speak of a man and a woman coming together as one flesh to provide, one a heart and the other vessels to carry the blood being pumped. But, there is one circumstance which does require such a union, with its regenerative powers. The union of opposites is the only possible realization of their procreative potential. If they do not come together, procreation will not occur.
There is a complimentarity of wife and husband which does not end in biology. Nurture of child, protection of wife and family, emotional differences, intellectual differences. The family is based on enduring conjugal partnership, a feat not possible in a homosexual relationship. Many pro-homosexual advocates will even profess that the optimum circumstance for nurturing a child is a father and mother. This is the ideal, the normative or how it was designed. Natural Law remains though many have suppressed the truth of Natural Law to profess the lie.
Beautifully said.