I had an orchiectomy ages ago, and my body hair did decrease a lot, but I still had more than I would have liked. My doctor put me on spironolactone and it gradually deceased to peach fuzz or almost nothing depending on location. Having been on it for years, I recently stopped taking it figuring that as I didn't have testicles I had no need for it. Unfortunately I noticed an increase in body hair once again and found I had to shave my legs more frequently and that I had a few dark hairs on my arms and tummy I had not had before. I am back on the spiro and now have no plans to ever cease taking it, barring medical issues. Some people are sensitive to even small amounts of androgens, and unfortunately I appear to be one of them. Even in cis women they've found that spironolactone can effectively reduce hirsutism even when their androgen levels are normal, so clearly it does something in your body that is helpful.
