"There are some valid criticisms that are being made, such as the measurement decision on who should be called a lesbian mother in this study," Regnerus said. "People might say that's irresponsible to do this study without all these stable lesbian couples in the study," he said,
adding the random sampling only found two out of the 175 children who said they lived in a home with both same-sex parents throughout all 18 years. "I would have been happy to compare them but they did not exist in large enough numbers."