Well I can kind of relate to this, since I really didn't have much libido to begin with. Like I hear other MTFs talk about staring at girls breasts or at guys broad chests without really meaning too, like a primal urge and that never really happens to me, so whatever libido I have isn't enough to distract me.
So far I hadn't really noticed much change there, and I kinda hope that when I increase my spiro does things stay close to how they are now, I can be interested in sex and sexual things, but basically only when I want to be. To me this seems much closer to how my cisfemale friends feel, they certainly have some libido and it seems abnormal to me to have no libido whatsoever.
This is one area I have always found a bit difficult to relate to, my cismale friends and the preHRT trans women I know seem to have a Libido that is so strong it interferes with their life and I have never expierenced that (then again I naturally have no Adam's apple and a bit of male breast growth so maybe I always had low T).