Why do women always go for the 'bad boy' types, even when they know they'll get hurt?

What i can never understand from all those girls sayin they like the bad boys and all this crap...why is it that everytime u girls get ur @sses kicked and beaten by these lil bad boys u always come back crying to the nice guys??? if u like ur lil bad boys so much why dont u take another punch to the mouth, or maybe let the mistress in ur house so he can have both of u at the same time!!! dont come back crying for help to the nice guy if u chose the bad @ss over him. thats just wrong! sometimes some girls arent as smart as they say they are.