How picky are you to avoid dating a person because their past is a dealbreaker?

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I recently (actually, it’s been a bit now but it’s a good example) got rid of a guy because he has tattoos and because I wasn’t willing to be his fifth sexual partner. His demeanor isn’t what I want in a man either, but you get the idea of what I’m asking.

To me, I see it as the past is permanent so it cannot be fixed, and some things just don’t settle with me. I’m one who absolutely cannot accept certain things. It’s like marrying a criminal in my view; it’s the past but it is permanently effective.

And I ask this for one reason: I get that judging someone on his/her past is not really an accurate or best way to go, but are there any who get my point and share it, or does this make me kind of evil? Because no, it can’t change. This is my view.
Because I’ll be honest: the first month or two I talked to him he had had a crush on me and he was very kind and treated me well. He made a simple mistake and I found out these things and just - well, that did it for me. Completely turned me off. I can’t lie: he was amazing as far as treatment. And this has been a while ago, but it’s my best example.
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Another example is say if you are together or you’ve gotten to know each other, talked/dated a while or whatever and then that person does something stupid like falsely accuses you. To me that just ruins the whole relationship and makes it weird from then on out.
How picky are you to avoid dating a person because their past is a dealbreaker?
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