I personally get tested every 2 to 3 months. I am vrey honest with my family doctor, always have been, and about what I do. There is such thing as doctor/patient confidentiality. SP's however, assuming they use safe practices, are less likely to be "dirty". Most woman are overly concerned about appearances, health, etc. Because SP's are so active, they will generally be aware and conscience of this and probably get tested more often than anyone else. If an SP is willing to do unsafe practices with you, whether it's the first time you meet or the 10th, chances are they use unsafe practices with others. This is something everyone should recognize, and I personally don't recommend doing anything without gloves, and if you do then you obviously know just what kind of risk you are taking. If an SP offers no restrictions always, it has to make you wonder if maybe they know there's something wrong and it just doesn't matter. You can only catch a STD once, STI's are cureable, STD's are treatable....
Use your better judgement, be safe, and you should be fine.
Taylor