There's been some posts here recently on STD transmission
I thought I would give my thoughts on the subject.

Every time you go have sex with a girl.
(A) There is a probability that she has a STD
and if (A) is true then
(B) There is a probability that you will catch this STD.

In order to reduce the Probability of point (A)
go to an escort who has the following characteristics

Reputable experienced escort with good hygiene and good reviews. Check reviews, experience, profile etc. Go early in her shift and early on her tour and/or at time you know she will be less busy.
It will be less likely that she was acquired an STD and there is an STD in the Environment and she has cleaned before you arrive.
A escort who charges extra in order to see fewer punters and/or for unsafe activity
also reduces probability that she is a carrier.
Also I would guess that gay, male bi-sexual, transsexual escorts, drug addicts(street girls) and
certain national groups have higher rates of STD. I not basing this view on any moral standpoint
but on the known statistics of HIV/AIDS prevalence in society. I would imagine if HIV/AIDS is
more prevalent then less-lethal STD are also.
i.e. If you go to an Heterosexual female escort from a country with low rates of HIV/AIDS who is not a drug addict the probability is less that she has an STD than others.

In order to reduce the Probability of point (B) happening

You should completely avoid the following actives
Bareback sex

You should greatly reduce or avoid the following actives
CIM, facials, Deep throat (STDs can live quite happily at back of throat)
rimming.

You should try to reduce the amount of time spent on and exposure to
OWO, reverse oral

Wash out mouth before and after OWO and reverse oral.
Engage head down as otherwise gravity will assist flow of an STD i.e. avoid face sitting.
Also avoid French kissing after an unsafe activity or if escort or punter has bad visible hygiene.
Maybe all escorts could reduce their base price and then offer these services as extra price?
This would reduce amount of people doing it.

In order to get a proper analysis of risk of OWO we would require following.
A survey of escorts and punters sexual health history from punting.
in order to actually come up with what the actually probability i.e. odds are of catching
disease from OWO with a random escort or punter.
We have no real idea just how many of use involved in industry are affected.
in this country. I think EI is only place where this could be done.

People need to remember that sex with a escort must be limited and safe.
You cannot except same level of service that you would with Wife/girlfriend.

Just my thoughts please don't ban me.