Biologically, I agree. And we would leave it at that [i]if[/i] there wasn't such a thing as very feminine men or very masculine women. So much so that their gender very much does not reflect what traditionally goes along with their biological sex. We as a society defined feminine and masculine outside of biological sex and suppressed people who didn't match that early on. Which while uncommon, is not abnormal or wrong. Luckily we have come a long way since then and people are more comfortable with expressing themselves as such now. I'm not saying that we should just let anyone use any bathroom, but moving forward the solution is not as simple as keeping things as they are now because this will only continue to come up more and more, creating more conflict, as more people become comfortable with being themselves as society continues to let go of some of the stereotypes it originally instilled. We'll adapt to how we change in this way as we always have. It's no different than previous civil rights issues and in the future will be looked down upon just as we do now at when we discriminated due to skin color.