Routine testing fixes most of issues too, many people just have a stigma of testing at all, let alone as often as they should. At this point, some forms of sex workers that have more partners are cleaner than the general population, just because they test often and fix things early. Which is worth saying because it is counterintuitive to what many people think will happen, linking promiscuity to negative health outcome (because they themselves don't test and just accumulate probabilities of infections). the line isn't preventing all exposure to disease, its fixing them when exposure occurs.

and yes, combining both strategies of protection alongside testing + early fixing reduces the negative consequence even more even when not preventing absolute exposure to disease.