For me, there are four primary guidelines I abide by:

  1. No single mothers. Tons of them in my area, but I've had a few bad experiences that led to be wary of moms.

  2. No involved women. Husband, boyfriend, girlfriend, doesn't matter. Maybe they'd cheat on them anyway, but it won't be with me.

  3. No drunk girls. If a girl is too drunk, I'm not going there.

  4. No bartenders/baristas at your favorite coffee shop. You don't want to 'kill the bar' so to speak.

  5. Must be semi-intelligent.

EDIT: After last night, I'm adding another one. A girl proudly proclaimed, "I don't like books!" My jaw still hurts from hitting the marble of the bar.