I was diagnosed with HIV last week. The doctor said, "you need to contact all the people you've had sex with in the past two years."
I said, "that's an awful lot of women, but I should be able to help with identifying about 50%."
He said, "wow, most people struggle to name one or two - do you keep records?"
I said, "no, the police do, but unfortunately half of all rapes go unreported."