If people want to indulge in "risky" behaviour, I have no problem with that. I just don't want to pay for it out of my taxes. It's like someone who makes a habit of jumping out of aeroplanes complaining that the government won't pay for his parachutes.
You will pay for it out of your taxes when those people become HIV positive - and it will cost even more than PREP.
You do understand that taking PrEP is literally the opposite of "risky behavior"? Just because you are on PrEP does not mean you immediately stop using condoms. Do some people use PrEP as an alternative to condoms? Sure but some women use birth control as the same thing. Please don't lump us all into the same category. Even on PrEP I still used condoms and only had sex with people who were undetectable. I used PrEP to cover all my bases, not to take risks.
Your edit doesn't really make sense, as a quite a lot of children are the result of "promiscuous" sex, and the NHS still pays for the relevant care.
You're still ignoring the fact that HIV transmission typically occurs in the context of regular sex with the same person. Having one-off sex with strangers actually isn't a particularly efficient way of becoming HIV positive.
Absent being a sex worker, the other is just hedonism.
Accidentally becoming pregnant can be exactly as "hedonistic" as accidentally becoming HIV positive.