Giving oral without a condom: either no risk or you need to be so unlucky, you were probably struck by lightning on the way there. You can catch gonorrhoea, syphilis, etc etc, so have regular checks at a sexual health clinic.
Bottoming anal without a condom: 'about' a 1% chance if they are HIV+ and not on treatment.
Bottoming anal with a condom: nil, unless there's a problem with it. In this case, go to hospital and ask about 'PEP', a month of HIV drugs.