Because they're disposable, they're fillers, good to practice on for experience.

They also tend to be less boring, more direct, they have a certain charisma, they're more likely to know who they are so less of that constant grating existential angst drama, they're not as much work, and they actually want you around more. They tend to be more affectionate, while also being more volatile about it.

A lot of why a woman might like "bad boys" had to do with who she is and what she likes and is drawn to.