The paper is a really interesting read. The correlations are pretty sound, though it would be a bit nicer if they revealed their sampling methods. 25 heterosexuals of each gender and 20 homosexuals/gender leaves quite a bit of room for bias errors given the population size.
The paper, however, does not conclude this:
"As far as I'm concerned there is no argument any more - if you are gay, you are born gay," he said.
Especially since
the paper itself gave this little disclaimer:
The present study does not allow narrowing of potential explanations, which are probably multifactorial...Whether they may relate to processes laid down during the fetal or postnatal development is an open question.
My apologies if I didn't cite
the paper correctly. Either way, how the heck did BBC draw the "gay from birth" argument when the paper itself clearly states that no such conclusions were made is beyond me. Expert opinion from a Dr. Qazi Rahman? That's still just conjecture - there is still no official citation that shows statistical evidence that this correlation is indeed before birth, during early stages of development, during the childhood years, or even during their adult years due to some nervous process.
It's pretty strong evidence that being homosexual is related to your body structure. It still leaves a bit of skepticism - namely, the development could be related to non-genetic causes, but it's still good to wait to see how the scientific community follows this development.
Good to know that BBC still card-stacks, though =/.