Actually, there is no way to change someone's sex.  Your post is incorrect to say this, and in that sense there is no such thing as "sexual biotechnology".  Sex is, as pointed out in another reply, chromosomal.  You can change your "gender appearance" via cosmetics, clothing, appliances, operations, and drugs to make your body appear more of a match to who you feel you are.  The technology exists to do that.  But that is not changing your biological sex.  Your post is confusing in your use of the words sex and gender.  Sex IS a "biological imperative" - you have the plumbing you were born with (intersex being a rare exception).  Gender may not be a "biological imperative" in some cases, but is for the vast majority (90%?  95%?  98%?).  As for politics, this is more about too much change, too fast, with too little thought vs.  why can't we change this now since we know this is correct and what is the point of waiting.  All I will say is that "slow down" is the right approach to change.