It is good to know a healthy debate transpired on this subject by Dumbo, Teak, et al, while I was sleeping, literally.
I thought Dr. Bob had chosen his words very carefully when answering a question on HIV risk and statistics, for everyone to understand, but sadly it is evident that this subject is still causing confusion and angst.
I have a great deal of respect for Dr. Bob, who has a considerable amount of experience and expertise, with his whole life devoted to the subject. I for one would not even attempt to challenge his views or have any reason to do so.
The reason why we find the often quoted HIV transmission risk alien or confusing is because these risks are generalized to "route of exposure", i.e. anal, vaginal, oral, etc, and applicable to all population samples. In any given situation, there are many other factors which can have a bearing transmission, such as, viral load, viral strain, host immune system and genetic disposition to HIV and other factors such as duration of exposure, type of exposure etc. Damn, if we think about it hard enough even the colour of bed-sheets, position of the moon/sun, and high/low tide could be a variable : ). Each specific situation is different and would have its own level of risk associated with it. Realistically, we can