No, it goes beyond sexual orientation in plain terms and it is certainly NOT, as you say, a matter of being deluded by antiquated preconceptions of LGBTQ people. What it IS a matter of is that the different roles of a father and mother bring unique perspectives into a child's life that allow him or her to both receive love and get a well-rounded experience while growing up. Don't get me wrong - there are a sizable amount of straight couples that are unfit to be parents, and adoption agencies should take this into consideration. But I feel that each individual child at least deserves to personally find out what a qualified (as in able to provide for the child's needs) man and woman can offer them while being raised. And the child arriving at their personal sexual preference should be an entirely separate matter away from this.