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

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If you're not comparing them to heterosexuals with similar dna and environment, it's difficult to tell what is the "norm," correct?

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I'm not sure what you mean by "similar DNA and environment" in the context of these genome wide studies. What they are essentially doing is focusing on linkage and using vast sample size and power to give their data statistical significance.

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And I would bet dollars to donuts that there are self-identified straight people with the genome characteristics listed in this study.

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Nothing is absolute, but a statistically significant difference is a statistically significant difference.

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If there are straight people with the genetic difference, why aren't they gay?

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This is an extremely simplistic view of genetics.

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Could the genomes be influenced by the environment and behavior rather than vice versa?

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As in one's behavior changing his DNA sequence? I highly doubt so. Mutations will always happen as errors in DNA replication will sometimes slip through repair mechanisms. But what you are describing just doesn't make much physiologic sense.