I think it's useful to have a series of red-flags, centered around pattern recognition, which help to identify dysfunctional members of the opposite sex who would make for bad partners.
For me, these are:
- She doesn't have a good relationship with her father.
- She is open about "hating children".
- She regularly uses drugs.
- She dyes her hair pastel/bright colors (blue/green/orange).
- She has tattoos.
- She has had sex with a reckless number of partners.
- She engages in serial monogamy.
- She dislikes and traduces her own racial group, while worshipping others (think wiggers and asiaphiles).
How about you?