Through sometimes fatal trial and error, HYDRA’s techs and doctors have discovered that it’s much easier to preform procedures on the Asset if they make it good for him. “Good” of course meaning anything from speaking reassuringly to him/petting him to getting him off (manually and/or with whatever device(s) the filler wants.
"Nice" HYDRA Medfet
*Bonus for any post-trauma shame/recovery.