40 years ago when I was converting from Virgin status, I had sex with 2 nurses in 2 different town up north. Condoms were not on the scene then and I got the clap from the second one, probably gonorrhoea. This was before HIV hit the scenes of course. It wasn't a big deal then.
10 years ago I got scabies from a WG in a parlour in the midlands. I think I have had chlamydia as the guy at the clinic looked at the sample at an angle and said, yep and I had 4 tablets to take at once whilst I was there. So in 11 years of punting not so many infections.
I have been for a STI clinic check up recently and the service is really basic now with all the cutbacks by the City Councils. I was lucky to get a blood test, my urine bottle was by the sink, not sure the one person clinic with slow laptop, nurse ever bothered to look at it, though bloods were taken.
I had a sore, small ulcer on my penis a few days and that got me worried. It was gone the next day. Nothing like those scary chancre ulcers pics on Google, so maybe not Syphilis? Ringing for an appointment is crap, you wait for an hour, you are number 10 in the queue and you there are no appointments to pre-book.
Judging risks is not easy, to be 100% safe - no kissing, no oral without, no body to body, no lapdancing, no joy?