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That's a brain scan. If anything it proves that gay men think in a way more closely related to women than to men.
"The researchers added that the study cannot say whether the differences in brain shape are inherited or due to exposure to hormones such as testosterone in the womb and if they are responsible for sexual orientation."
So in essence they've found something that might lead one to believe that there is a genetic reason behind being gay, but noone has proven it with gene studies directly, which is what you statement implied or flat out said depending on how you look at it.
This could lead one to believe that being gay is genetic, but to prove that you would have to do a study of the brains of children as they grow and see when this difference manafests itself and why.
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