i think it's very difficult for most subs! (just a guess lol) but you get used to it, it takes a while for most of us i guess but you do, im not sure it's so much as tailored to the sub as a control thing in most cases tbh
i went from masturbating maybe 4 times a day to none only with permission and mostly that was denied, i wasnt allowed to touch myself at all other than to bathe! never mind cum (still arnt) ...i was only allowed to do it in front of IH and as to begin with we only saw each other maybe 4 times a week that was real hard!
and in case you're wondering steelf1sh... a few years down the line?? its still f***g horrible sometimeslol