For 30 years, the libs have waged war against the US, and one of the ways has been through the DNA arguments (on soooooo many issues): "We're this way, those people are that way -- because of DNA. Accept us. We can't help ourselves, our lives are horrid. We are victims." And then you look at WHICH communities abortion has been pushed the hardest by the sisterhood arm of the Liberal Party. So, this leaves a number of children and babies open for adoption. And which "community" cannot biologically have their own? Hetero couples are hoping to simply have at least party of their own gene pool, a known, be some kind of synergistic bond to the baby. Understandable, really. I have also seen, over the past 10 years, more and more gay/lesbian couples going for fertility clinics, as opposed to adoptions, and for many of the same reasons as straights. The DNA issues.
It makes more sense for gay/lesbian couples to go to private fertility clinics. None of the barriers/red tape/controversey of adoption. Besides, most gay/lesbian families still adopt and are foster parents.