i can see why people think this is a good answer, but i disagree, because watching porn is not a fundamental part of who you are. this would be a good answer if the question was something like “would you give up your favorite hobby for your partner?”.

if you truly consider quitting porn as changing yourself, you need to consider if your porn habits are healthy.

preferring a partner who doesn’t watch porn is no different than preferring a partner who doesn’t smoke, do drugs, commit crime, do sex work, post their nudes online, or talk to an ex. just like how these are mostly reasonable things to do when they do not affect a person you’re committed to, these are all reasonable things to expect someone to give up when pursuing a relationship, sure it might be an “ultimatum” to say you don’t want to be with someone doing it, but there is nothing wrong with that.

while there are obviously people who wouldn’t be willing to give these things up for anything, there are many who would, and it’s not inherently bad to ask for it or state a boundary. it is entirely up to each individual what they are willing to change for a partner, but just being asked to change something or told something you’re doing is a dealbreaker is not wrong, and it does not in any way mean this person is trying to change who you are or mold you into someone you’re not.