If we want to take a hard line on your belief that all the OP is asking is "how would my sex pardoners react", then you're absolutely right, we have no idea. So we should lock the topic and call it a day.
I'm not demanding a hard line on anything, I'm just clarifying some statements that aren't Completely factual, as part of the discussion. Not you're wrong, for example testosterone has An affect on libido, however that affect is somewhat exaggerated by medical professionals, whom only really focus on 1 end of the market. (Men with the money to spend on sex aids, and women.)
So, let me qualify my opinion: I'm transgender, i work as a therapist with other transgender people, and Castration Ideation is a major part of it, due to negative standards of having balls. (Positive for men, negative for transgender women.) Also including several who are post-operative, and have had testedectomies. Women who have had mastectomies have experienced a loss of sexual desire as well, but not all of them do. Many of my friends were unable to have sex/desire before they had the offending gonads removed.
However, I'm not one to snap diagnose someone with gender disphoria, based on so little, i can only speak from experience as anyone else can. However, my personal experience includes castration play, and self harm, during puberty.
So, it's like a headache. A nonspecific symptom, it could be a migrane, a tumor, caffiene withdrawl, or just a headache.
This could be castration Fantasy. Which i have, all the time, rubber bands are great to stimulate, and simulate that. It could be psychosis, it could be some level of gender disphoria (If so, I'm here to help) castration anxiety, or it could be something else.
None of us are wrong yet. I'm just clarifying specific parts of some statements, while basically agreeing with the rest. Sorry if that wasn't clear.