Studies based on a handful of self-selected subjects proves absolutely nothing. Lia Thomas has a male brain in a male body, a male heart in a male body, male lungs in a male body. Lia Thomas has male genitals in a male body. There are some studies that indicate that a few men and women have brains that are more similar than less similar, but that's just a bit of normal overlap of two distributions. Those in this overlap are just as well heterosexual, homosexual, transsexual, or whatever.