Comment: Jesus was talking chosen family v. natural family. It is exactly the same principle. One flesh is not just about sex. Marriage is the rite that separates you from your family of origin. It is the essence of adult autonomy. In society, the question is solved. The anti-equality folks lost embarringly. The argument often made about procreation was soundly rejected as a legitimate public interest for society to deny marriage equality. The change will come IN the Church because families with gay kids won't leave. They will demand Church recognition and they will get it. If you don't approve of gay weddings, RSVP no when invited.