You don’t have to know why your Man likes to be rough or for yourself to like being roughed up. You have your role to fulfil, it’s just the way things are. You can walk away if you want. But will you?
Even the most experienced of fags has to contend with the varying demands of different men. The dude it sucked off in an alley last night may have been relaxed, casual, luxuriating in its oral skills; the top using its throat tonight may well prefer hearing it struggle & choke.