Yeah, there are deal-breakers out there other than sexual compatibility. Best to rule those out before the FIRST date.
In my own case, first thing I decided was "No Democrats".
There are some things you can learn before a first date, but to get inside a person's head about a lot of things would likely require a date or at least some time to talk first to see if there is enough in common to even go on a first date. As an aexample, I would not marry a woman who is not a Chraistian, nor do I want to marry a woman who has younger kids; therefore I do not date non-Christians nor do I date Christian women who have younger kids. It isn't fair to either them or me. I have a few women friends in that situation and because they know my desires in that area, we can have a friendship without any misunderstandings.