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The bacteria inside the colon, themselves, don't make for STDs in the traditional sense of the term. They can, however, cause bladder and vaginal infections among women if their partners go from anal to vaginal sex without washing first. Good hygeine, in this regard, just makes good sense.
There are reports that the anus, if stretched too far, can lose its original elasticity and lose its original tension. That might be the explosive diaherrea you were mention above.
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