While fortunately the HIV is a rather fragile virus outside the body it is true that it can be spread. Not on a toilet seat however.
I always disinfect any facilities I'm forced to use in public.
This does, however, serve as a great argument that sodomites infected with this voluntary disease should be quarantined like the lepers of old. It would stop the disease dead in it's tracks as in 20 years or so all the carriers will have died off.
Hey, I'm with you. Assuming a law could be passed, the resulting legal maneuverings would be amusing.