Unfortunately, if you engage in sexual activities there is always a chance to catch something...
Yes. So it's really playing with fire right across the board isn't it? I still can't understand how people rationalize that BBFS is insane but if you are smart and bright then all the rest is nothing to worry about.
...you just need to lower the risk. That's why I stick to better MP's like pure and better known SP's and try to stay away from cheap providers. Always look out for unusual or smelly discharge, a rash, bumps, warts, pimples, blisters or sores around the genitals or mouth. Look out for flu like symptoms like a cough and sore throat. Always do a visual test and be aware. If you see something you don't like don't be afraid to stop
Couldn't you just do all those things in the case of BBFS too? Sure if someone obviously has signs of being sick then stay away, but from a medical perspective I think you would be deluding yourself if you thought this was effective advice to avoid STIs.