So anal sex without a condom is very risky for both the active (insertive) and passive (receptive) partner. Condoms provide a very effective barrier against HIV.
Always:
Oral sex is much less risky than anal sex without a condom and we know the risk of passing on HIV to either partner through oral sex is low. However, it is better to avoid getting semen in the mouth, particularly if you have any cuts and sores (e.g. ulcers and cold sores) as this may increase the risk of infection.