First, the probability that the thong compresses the anal capillaries makes people suffer from hemorrhoids is six times that of ordinary people.
Second, G-string oppression of genitals will make women three times more likely to suffer from gynecological diseases than ordinary people.
Third, there are many harmful bacteria such as Escherichia coli in the anus, and thongs will spread these bacteria.
Fourth, there are worms and other parasites in the anus. Wearing thongs will spread parasite eggs to other places.