I have cited this piece 3 times here. Those who are open to reading it will--but probably don't need to. Those who aren't won't. The state of research about lesbians and gay men raising children is also out there for anyone to find. So far, no disadvantage has been conferred on the children of same-sex couples. The feeling among sober scientists is that this does not mean some disadvantage might never show up (theoretically) but that since it has not so far, it is not likely to. 

Social sciences are sciences. Psychology is considered a life science at the university my daughter attends (rated one of the top 20 in the world) and is taught that way. People who think this stuff is fluff don't know what they're talking about.