The chances of catching hiv from conventional sex are slight but it always pays to rubber up - would you walk across a field with an umbrella up during a thunderstorm?
AFAIK no one has ever caught hiv from a bj so from my point of view there is no point dulling the pleasure.
The advantage of rubbers is that they offer some protection against stuff that is far easier than hiv to catch from sex - like Hepatatis - which can be very nasty. And they stop babies
