I would personally never, mainly because most client literally couldn't not care less so there is no need and the ones that do specifically ask for owo are usually not the type of clients I like to see anyway. At this point I ignore people who ask for any unprotected services and it made my work easier.
Plus std in throat is nasty, my friend had it in her first month of working, the back of her throat completely white, it looked like strep throat.
But probably most importantly I've now heard of 2 people with throat cancer, that is direct result of hpv virus, I imagine if you have owo with hundreds different people you can possibly catch all possible strains of it, including cancerous ones. It won't happen to most people, but if there is literally a chance I get cancer from it when I'm older, there is no freaking way