Don't join the non-mathematical people who think they have to stop BB after 199 punts. You can become HIV positive after one f*ck - and your lucky bastard next door neighbour is safe until the punt after 399 punts.
You are actually wrong there.
That is 1 in 200 if you have sex with girls who have HIV. Despite the scare mongering, I doubt that every girl who offers BB on AW has HIV so the odds are far higher than 1 in 200.
As Hooper says, it is all about a calculated risk and how much of a risk you are willing to take. It always makes me laugh how in the paid sex business people get all high, mighty and moral about people who engage in BB (not saying you do BTW just making a general point).