re: One step closer to tying homosexuality to the human genome

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This is what's confusing. How do you know if you're "one step closer" if you haven't found what you're looking for?

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What you have to realize is "a gene" for something as complex as sexual preference will likely never be found. That's not the way things work. Even for better understood, very heritable pathologies such as diabetes or HTN, there is no single gene implicated. Heritability is the more interesting subject here, and evidence of such supports the theory that sexual preference is somewhere in the DNA (whether specific sequence, alleles, epigenetic factors, etc) even if those specific mechanisms are never completely elucidated.