To swim during menstruation a woman has to use internal products;
A woman cannot wear a pad while swimming as it would fill with water so be unable to absorb menstrual flow, the flow would bypass the pad anyway and the pad would likely fall off or even cokme apart. Tampons or sponges may get wet is water gets into the vaginal canal, but for the most part internal menstrual products don't get wet while a woman is swimming.
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The sanitary towel would get soaked, slow her down, and be of almost no use whatsoever. Tampons are the only real solution to swimming with your 'cycle'.