Are you strictly dating vegans? Maybe you are open to dating vegetarians? Maybe you view it as a personal choice and you don’t mind dating non-vegans?
Does the goal of the relationship change your answer? If it is a long-term relationship, or a short-term one, or a casual one, or friends-with-benifitis or even a one-night-stand?


Personally I only date for long-term relationships and for those they must be a vegan as well.
In theory I doubt that I would be comfortable to even have a one-night-stand with a non-vegan (including vegetarians)