From
External Link/Members Only:
'HIV is found in the body fluids of an infected person. This includes semen, vaginal and anal fluids, blood, and breast milk.
It's a fragile virus and doesn't survive outside the body for long. HIV can't be transmitted through sweat, urine or saliva.'
also
'The chance of getting HIV through oral sex is very low and will be dependent on many things, such as whether you receive or give oral sex and the oral hygiene of the person giving the oral sex.'
and
'It may also be possible to catch HIV through unprotected oral sex, but the risk is much lower.
The risk is higher if:
the person giving oral sex has mouth ulcers, sores or bleeding gums
the person receiving oral sex has recently been infected with HIV and has a lot of the virus in their body, or another sexually transmitted infection'
It's pretty vague and very speculative - it certainly refutes the original bollocks of OWO=BB