Why do women already in a relationship try to date me?

I haven't dated any women yet as I have focused on other endeavors, but the majority of women who try to get involved with me are dating or even married to someone else. I would never get involved with a woman like that because 1. It is adultery, 2. what would stop her from doing that to me? I don't understand why I appear to be affair material. I flirt with single women, but never seek out unavailable women, yet 80% of women who seek me are involved with someone else. I don't dress provocatively, I am very formal, and I don't mess around. I don't know why I get more interest from involved women than single.
Why do women already in a relationship try to date me?
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