OWO (pretty much a dealbreaker, unless there are other services such as sub\dom)
Penetration (protected) - also check no bareback
Facesitting
Bonuses
BDSM - giving\recieving
Come in mouth
Swallow
Facials
Rimming (recieving) - i quite like this, it's so dirty that its a massive turnon.
Then standard due dilgience checks
Check the nationality, read the profile fully
Check adultwork feedback, photos and rates
and most importantly of all... put her User Id into that lovely search box in the top right of this very screen.
All of the above has given me an unbroken streak of about 20 very good to excellent punts