Yep, Celeste really speaks to my initial reaction to the article.
Let me also point out that, any one studying Statisitcs 101 can tell you, correlation don't not mean proof. Just because their is more a correlation between homosexuality in biological brothers might rule out one social factor, it doesn't mean that it prooves the biological factor. There are too many exception. Gattaca himself is one, an older brother who gay. I've also met quite a few identical twins who are one gay one straight. If sexuality is biologically and genetically determined, that should be impossible. I take this article with a grain of salt, and wait to see how the study is reproduced and challenged.
