Reading the many, many scientific posts on this forum, I have the idea that, although this retrovirus may be transmitted very easily, it still may not happen very often. There has been a lot of discussion about it not being easy to find in blood, etc. and that it may "hide out" in tissue reservoirs. So perhaps even with a lot of kisses, for example, the virus is just not present in the saliva, etc. to be transmitted most of the time, thus the low rate in the general population. If I'm making a leap, someone please correct me. I'm only throwing this out because no one seems to have explained how some of these seeming contradictory statements could fit together. This is definitely just speculation on my (non-scientific) part!