Prof. Mark Regnerus sat down with Christianity Today to explain more about his study on outcomes of children raised by a same-sex parent:
This is the key area of distinction between my study and most others. Almost all studies that came before this one were small and "nonrandom." That is, we have no idea how similar most other studies' research participants are to the general population they seek to study. And with many previous studies, I think it's fair to be skeptical. For example, if you know you're participating in a small study on gay parenting and that it'll make the news and perhaps have political ramifications, I think it's fair for scholars to wonder whether such a study will yield valid, reliable data.
The NFSS, on the other hand, is much larger than most others, and is a random sample of the population of American adults ages 18–39. I focused not on their parents' sexual orientation—after all, it was a quite different era back then—but on their parents' relationship behavior. So I compared how young adults whose mothers or fathers had a same-sex relationship fared when analyzed alongside other types of arrangements, including the traditional, biologically intact married mother and father.