We still don’t know enough about how hormones affect the brain in a way that could legitimately be said to be a causation of behavior.

“But getting from brain to behavior has proved a challenge. In 1995, the pioneer in this research, Roger Gorski, lamented, “We’ve been studying this nucleus for 15 years, and we still don’t know what it does.”19 Nearly a decade later, neuroendocrinologist Geert De Vries pointed out again that scientists have “not gotten an inch closer” to working out how this sex difference in the brain translates into behavior. And not for want of trying.20 Demand a story that includes a clear hormonal beginning, a neat neural middle, and a convincing behavioral end and the best that researchers have to offer involves a small area of the brain stem that innervates the penis. Without wishing in any way to denigrate the painstaking work of neuroendocrinologists (or, for that matter, the glory of the male machinery), so far they are falling way behind in the schedule of scientific discovery that Brizendine and others blithely attribute to them.”21

Fine, Cordelia. Delusions of Gender: How Our Minds, Society, and Neurosexism Create Difference (p. 104). W. W. Norton & Company. Kindle Edition.