how to prevent catching stds?

[LetsPOZBreed]

Total prevention would require abstinence, which I don't recommend.  This COVID lockdown has taught me just how much I miss being with another man.

If your goal is to REDUCE your risk, instead, then I'd take the advice of some of the commenters above.  I've accomplished this by narrowing my sexual activity to a small subset of regular or semi-regular partners.  While this isn't foolproof (none of us are monogamous), I haven't caught anything in about 8 years.  

It's a part of life of being a BB bottom that you're accepting some level of risk of STI's.  As long as you test regularly, though, you can get treated for anything that may arise and put fewer folks at risk as possible.

[Bimarried001]

This is a risk that we all (those of us that fuck raw) take and we take knowingly. Some of us take more risks but all it takes is one time. 
Most of the loads I take are from random men at parties or X rated theaters. I understand and accept the risks. I can reduce the risk of contracting something by using condoms but that would take away from my pleasure so I take the risk. 

[Kimberley]

You can't prevent it. as a true cumdump whore you need to accept you are going to be infected on regular basis with STDs.

[LittleCumSewer]

lol the only way you can avoid catching Stds is to not be a bareback cumdumpster for strangers and anonymous breeders. when you are a shameless faggot who is a bathhouse cumdumpster, porntheatre fuckslut, cruising spot trash, tranny whore and an online cumhole catching stds on a regular basis is just expected. I can't even remember how many times I have tested poz for various bugs.