Well Rolf, I was never that great at statistics - more of a chemistry man - but your statement
"Lets say the relative risks are:
OWO 1:100
BBS 1:50
PS 1:1,000,000" is totally assumed, no?
Where do you get those odds from? I can't find them anywhere?
They are just examples to show the point. Let me try to make it even simpler with a super simple example.
The one of the most common cause of road death for a pedestrian is being hit by a car on a standard road. The UK has many different types of road Including Motorways, duel carriage way...
I don't think you need a PhD in Statistics Just common sense to agree the following in terms of risk involved in crossing said roads (highest first).
1: Motorway
2: Duel carriage way
3: standard road (one lane each way).
But yet if you look at the raw statistics you would see that in terms of number of deaths the opposite is true. I.e. very few people get run over crossing a motorway and thus draw the incorrect conclusion that it's safer to cross a motorway that an A-Road...
To get back to our original point, you cannot look at a statement like "the most common way to catch a STD is oral" and conclude that Oral is as high or higher risk that BB. You need to look at the underlying data I.e.:
1: Number of people who do Oral Vs Sex
2: Number of people who do OWO Vs BBS
3: How true was the data? I.e. people lie, "did you use a condom", "Oh yes doc",... I can see in you body language you are either lying or very worried about something on the floor...
The figure you want is:
If I as an escort have BBS with a HIV+ guy what is the probability I will catch it? Answer ~1:1000.
If I as an escort have OWO/CIM with a HIV+ guy what is the probability I will catch it? Answer we don't know but estimated to be very low. I don't know their has been a reported case of this even.
I don't think we need to labour this point anymore, if your still unsure and worried, pop along to your GP or local clinic (preferred) for a chat BUT ask the correct question not the one which will get you the answer you want to here. Ask "Is unprotected sex no more risky with a escort that OWO"