I used to always use protection but one time this girl got me all worked up and climbed on top of it when I wasn't wearing one. The very next time I had sex, I couldn't orgasm with a condom on. From that point on, I either had to take the condom off or I just never wore one at all. And for a while there (2003-2009) I was pretty much a whore. My reputation is still shit in my hometown and I admit that some of the girls I was messing with were not the kind you'd want to bring home to mother.
My last job (as a cop) and my current job (nuclear security officer) required constant physicals, blood tests, and urine tests and it turns out that I'm clean. For a while there, I was scared shitless. And the whole time (except for a period when she left me from 2008 to 2009), I was coming home to the mother of my child and putting her at risk, too. I'm very lucky that she came back AND that I didn't wind up killing us both.