Kissing the scorpion
A relationship dysfunctions where a person seeks the attention of, a relationship with, or to be close to a known dangerous person or thing. Kissing the scorpion turns out badly because kissing a scorpion will get you stung as that's what scorpions do.
Why is Jill trying to go out with Jack. He is a gang banger. She is juzt kissing the scorpion.