I really don’t get your argument at all. Testosterone and other androgens can increase masculine features. In a purely statistical sense gender and sexual apparatus are heavily correlated, but then I see gender as being more of a spectrum than a binary anyway. I think these things can be influenced by the environment a lot, if you believe you’re a bunch of chemical reactions happening in a biological system how can what we be anything apart from hormones, genetics and culture interacting to express a gender?