Worse thing, I got stealthed by a guy, thought he had a condom on but didn't.  Wasn't entirely has fault, it was a 3 some, I was sucking of his partner and was letting him tease my ass with his cock, I assumed he had a condom on as I brought some with me and gave them to him, only really realised when he came and I he asked how I liked his seed I freaked out.

Around the 100 mark I have played with, anal about 50 of them

Getting HIV is my greatest fear