“Is homosexuality just an extreme r-type development of the amygdala?”
Perhaps...but how could it be determined that such connections were not established through repeated use?
(the exercise of homosex)
IIRC, the researcher who initially wrote breathtakingly about the ‘enlargement’ of the 7th(?) interstitial nucleus of the amygdala...that they continue to clutch to their dark breasts as a reason to howl; “NATURE! NATURE!” ???
Right, he was a homosexual.
There is research which indicates the changes begin in the womb, possibly relating to stress reactivity affecting genetic expression in the mother.
Again, the brain is a complicated organ, and you will get all manner of variation, but that is the point. Much of homosexuality may just be the outliers of the r-strategy, whose development overshot the mark.