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The trick is to drink a D-mannose sachet before sex, I think (correct me if I'm being presumptuous, sex is the universal trigger...) so that you can flush away all the bacteria with your super-charged pee afterwards.
I do believe there's some evidence that pro-biotics are useful.
Lastly, consider wipes before sex - they have a bad rap for being an ecological hazard and perfumed nonsense, but there are some on the market that are specifically for UTI prevention.