How dangerous is Christian XXX to you?
A hypothetical

Scenario 1.
Christian's AIM test is 6 days old. Today Christian shoots a transsexual film. The transsexual he shoots with shows a clean AIM test, 10 days old. However, the transsexual was escorting last night and was infected. HIV is transmitted to Christian.
Tomorrow you're shooting with Christian, he shows up with a clean AIM test, you shoot anal with him, no condom.
Your next AIM test is in 12 days, how lucky do you feel?

Scenario 2.
You're booked to work with Christian, but hear of his reputation for gay escorting and working with transsexuals, it makes you uncomfortable and you decide to cancel. He emails you, phones you and texts you, berating you for your ignorance, homophobia and costing him money, he harasses you for a few more days, vilifying you on his blog. Eventually he goes away.

Two weeks later there's a HIV outbreak. Christian XXX is found to be at the heart of it, how lucky do you feel?