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Vag has a pr strong self defense flora, if you make sure youre halfway hygenic, its usually fine.
The real issue is bacteria on the way to bladder.
CAN happen to men, but its very rare. if youre a girl from a family with really sensitive bladders though, youre gonna know.
especially when it becomes a kidneyinfection, its horrible. Ive never met a back to front girl (knowingly, at least), I dont think that exists cause youd get bladderinfections every few weeks.