There have been about a dozen studies. Hundreds of participants overall.

MRI imaging is very unreliable when predicting behaviours

But it's good at looking at the structures. I've had one myself. An MRI can pick out differences in structure to the mm. It's how drs keep track of tumor growth.

The structures correlate well to physical sex and when they don't it's almost always because the subject is gay.

The later MRI studies don't support the wrong sex brain theory anyway, but they do support homosexuality as being innate. If you trash them you're just damaging the argument for accepting being gay as something you can't change and ignoring research that's showing brain sex development is not what is behind being trans.

And being gay and not wanting to have sex with TIMs is kind of a thing here. The brain sex is real/sexual orientation isn't a choice because of brain development supports the lesbians not wanting to sleep with TIMs etc.