I've given you my thoughts on this... Even if this study says what you believe it does; even if the study is sound; it does not prove that lesbian couples should not be parents.<quoted text>
Then there's the latest, largest and most scientific study of it's kind that shows out of all family types, lesbian couples rate last. After single parents.
To say that something is "not as good as" is not the same as saying "is so poor that it should not exist".
Did this study compare lesbian couples, for example, to poor heterosexual couples? Did it compare the children of lesbian couples to children who are in the foster care system? Did it compare lesbian couples to couples who create a chaotic home environment?
I can't find the study that you cite, but if I'm not mistaken, it was commissioned by a right-wing group.
Maybe you'll give us a link to the study so all of us can draw our own conclusions.