Write out a lost of attributes that are important to you - for example: looks, tits, age, sexiness, review count, whatever and score each SP out of 10 for each attribute. Add up the score and fuck the winner (assuming she's available). If you hesitate, then you didn't want to see her really in the first place. Pick the next one. Continue until you reach the one you deep down wanted to see but just needed some 3rd party endorsement.