Below are some things I've found online that may be helpful in any context and regardless of your sexual preference or orientation.
- The lining of the ass is delicate and can be damaged easily so relax your ass and use lots of lube. Lube reduces friction, which reduces the number of micro-tears in your ass. Tears give an entryway to the blood stream. Also bare-backing after fisting or rough toy-play increases risk.
- Don't cum in the pussy or ass. You significantly reduce risk if you pull out before cumming. Don't allow that fusion or chemical reaction of simultaneous 'cumming together' by both you. It's extremely risky.
- Ass fucking is more riskier and dangerous than pussy fucking. If you're a gay guy you might choose to fuck rather than get fucked.
- The longer and harder the fuck, the bigger the risk.
- Don't use any toys that will significantly dilate blood vessels in your ass, increasing blood exposure while you fuck.
- Don't douche right before or right after.
- Don't sit back and admire your handy work after you're done. Get up and clean off immediately w / soap & water. You can come back later and lay with your lover and be amazed at the great sex you just had. Many people catch stuff when they sit there proud of what they've done allowing infection to set in from the dried up pimp juice.
Now these are only risk reduction measures should you choose to BB and are applicable in the RW as well.
Now happy risky bare-backing