When you say you are dating someone, do you assume an exclusive relationship?

I ask this question after answering another dating question that had to do with a guy dating two different women. To me, I don’t assume an automatic monogamous relationship when I am dating someone unless we have discussed monogamy and made that decision. Up to that point, I feel free and think the other person should feel free, to date other people as well. I do not have a problem with this. What say you? Agree with me or disagree? Why so?