I can't find a source on this, but it
says:
The rate of HIV transmission with sexual
intercourse is much lower than with other
sexually transmitted
diseases-approximately 0.3% per sexual
contact with an HIV-infected person.
However, some persons have become
HIV-infected after a single sexual
contact, while other persons have remained
uninfected after hundreds of contacts.
from:
http:
//library.med.utah.edu/WebPath/TUTORIAL/AI
DS/HIV.html
Looks like it is a med school in Utah?
In a University course we learned that the
chances of transmission are certainly less
than 100%, but as I can't remember the
numbers off the top of my head, I will
have to check my textbook when I get home.
I don't want to give you inaccurate
information.
Even if it is way less than 100% - why
take the chance?