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This looks like, once again, junk science.

I would suggest that it probably looks like junk science to you because it doesn't agree with your beliefs.

If the brains of gay men and lesbians show differences to straight men and women - that is data. A scientist is interested in data like that.

Others have particular agendas -

If the brains of gay men and lesbians show differences to straight men and women - that is data.

All kinds of mental illnesses cause differences in the brain. Some are genetic. Many are the result of environmental factors, trauma, or bad habits that the individual developed quite on their own. As such, this data by itself (if accurate) proves exactly the same as would similar data from the brains of people with PTSD.

I would suggest that it probably looks like junk science to you because it doesn't agree with your beliefs.

Indeed, saying something is junk science doesn't make it junk science. But I look at all the available evidence, and all the available evidence tells us this is junk science.

If the brains of gay men and lesbians show differences to straight men and women - that is data.

That's an "if" that has been previously debunked, and by homosexual scientist Simon LeVay:

"[His 1991 research] made the unassuming LeVay one of the most misunderstood men in America. "It's important to stress what I didn't find," he points out with the courtly patience of someone who long ago got used to waiting for the rest of the world to catch up. "I did not prove that homosexuality is genetic, or find a genetic cause for being gay. I didn't show that gay men are 'born that way,' the most common mistake people make in interpreting my work. Nor did I locate a gay center in the brain --INAH3 is less likely to be the sole gay nucleus of the brain than part of a chain of nuclei engaged in men and women's sexual behavior. My work is just a hint in that direction--a spur, I hope, to future work."
Source: Interview with David Nimmons (March, 1994) "Sex and the Brain", Discover, Vol. 15, No. 3, p. 64-71.

Every study on a homosexual brain since LeVay's study has been debunked. The study you referenced came out today so give it a few days for others to look at the data. History tells us this study will be debunked and we can already see it's based on humans responding to pheromones... an assumption.

Others have particular agendas

Indeed they do.