So this is totally off-topic. But really interesting none-the-less.
HERE'S THE ARTICLE: http://www.world-science.net/exclusives/080208_gaygene.htm
Although this report just focuses on men (WTF - no dykes in Samoa?) it's still a really interesting read, whether you agree with it or not. Basically this theory was floating around that gay people existed to help raise kids, rather than pop out kids like a tennis ball launcher.
Nobody could find any support for this argument... mostly because homophobia is so rampant that people distance themselves from them. But now there IS evidence of this in Samoa, outside of western culture.
The article also points out that being transgendered is still listed in the Psychiatric Association Handbook as "gender identity disorder." Can somebody please edit this typo? It's not the 19th century, in case you haven't noticed!
Although I don't know how useful this is, it is an interesting theory and I think should be used in adoption rights litigation. As times become more and more conservative, it's awesome that there's still people doing research like this.