As an addition to my above post, just over 20 years ago I decided to give up punting (it didn't work) and after punting for sex for over 10 years I thought I'd do few things I'd yet to do.
I looked at a review site that was available at the time, and found great reviews of a Finnish girl who worked at parlour in Edinburgh. I made a booking and went to see her.
She was gorgeous. Apart from Vanilla sex she gave me, and I gave her uncovered oral. I was never keen on the taste of my partners pussy but this Finnish SP tasted beautiful.
Shortly after leaving the parlour the realisation hit me that I could have caught something. This was despite punting with some less than clean street girls over the previous years.
I remember, foolishly, going into Burger King to get some fries in the vain hope that the salt would kill anything in my mouth and throat.
I researched STI's (for the first time) and was mortified at how many there were and all of the symptoms.
I started counting down the days to see if anything would show. However, a week later, I got a sore throat. This was a sign of oral Gonnerhea.
I shat myself and booked myself into the local Gum clinic ASAP. They told me that HIV wouldn't show for 3 months.
I think, during that time, I got a rather large amount of grey hairs on my head but, luckily, everything came back clear. The sore throat was just a normal, seasonal, bug
Since this instance I've always been paranoid and take the utmost care to ensure that, as much as possible, there's very little risk of infection.