If you have lip herpes, there's a good risk of giving it to your partner either way, especially if you have an open sore.
In general, the chance of transmitting HIV through oral sex is very, very low, though theoretically possible.
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At the 4th International Oral AIDS Conference held in South Africa, the risk of transmission through oral sex was estimated to be approximately 0.04 per cent per contact. This percentage figure is a lot lower than the two American figures, because this figure is a risk per contact percentage, whereas the other figures are percentage risks over much longer time periods. Oral sex is still regarded as a low-risk sexual activity in terms of HIV transmission, but only when more work is done will we be clearer as to the risks of oral sex.
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http://www.avert.org/orlsx.htm
At .04 percent, you have a 1/2500 chance per contact with a person known to have HIV to catch it.
The risk appears to be a bit higher from cunnilingus than from fellatio.
Gilda