The percentage risks of getting infected from specific sex acts is not "ridiculous". It is actually quite well studied and there are plenty of research papers kicking about on the chances of getting infected from various pathogens after intercourse with a know infected partner. It does get abit ridiculous when you are try to calculate a percentage risk from a sexual partner of unknown status. There are just too meny variables.
Exactly so. You can attempt to provide comparative data of transmission risk firstly for specific STI’s and then adjusted in relation to specific sexual acts, but only if one person is infected and also knowing what they are infected with.
External Link/Members OnlyBut irrespective of that not being what the OP said, I would suggest this data, whilst undoubtedly interesting to academics and healthcare personnel, is of little practical significance to those engaging in unprotected sex.
I could go out tomorrow and have vaginal sex without a condom with twenty different people and if none of them are infected then my actual risk is zero. If the first one is infected with Chlamydia the commonest STI then my risk is perhaps around 5%. If Gonnorhea then as you point out in your other post the risk is higher. This calculated risk will then be adjusted depending on the sexual activity, gender, whether giver receiver etc. This is then subject to other variables such as ethnicity and individual host response etc.
As I posted earlier in the thread
The question asked is seriously flawed .....
The subject itself is both very simple in terms of 'the basics', but exceedingly complex in the detail especially in terms of measuring and quantifying.
Everyone should know the basics and it doesn't require speaking to a medical professional, or asking SP's or punters. Google is your friend.
Comparative risks without values are much more helpful, ie anal sex is generally greater risk than vaginal, which in turn is greater risk than oral sex etc. This is why, as you pointed out, the NHS information is simple and practical, which is all that is required for the target audience.
However you cannot even attempt such complex calculations, without knowing the exact status of the other person and if you knew that they were infected, you probably wouldn’t have sex with them, or if you did you would ensure you used a condom for all sexual activity to significantly reduce the risk together with testing.
In effect this is the default position anyway ie that you assume the other person is infected with at least one pathogen and practice safe sex … or don’t and take your chances accordingly, but trying to put a figure on an individual risk is of little practical importance to the participants.