A healthy man fucking an HIV positive woman anally is lower risk for the man . However, if there is any micro tears (that you can't see visually) in the woman's anus and he has a cut or open sore on his penis (that maybe he can't see.. like from shaving or something), transmission is possible. Obviously an HIV positive man fucking a woman anally is about the highest risk to transmit HIV there is.
There is nothing credible that can say drinking urine transmits HIV (at least from my knowledge).
I assume you are asking this because you are entering a relationship with a woman who has HIV. Simply put, you either have to use condoms for everything, or make peace with the fact it is possible you could get HIV. Different sex acts carry different levels of risk. Also if your partner is on certain medications that lower the viral loads, it also lowers the risk. However, nothing is 100% fail safe if you are going to have a completely bareback relationship. Most would advise against doing anything bareback because you can only play the odds so much before you get HIV from her.
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