Doctor can examine: Anuses are not designed for in-out, in-out sex. Just like in a big city, some streets are one-way and some streets are two-way. A vagina is created or evolved to be a two-way street (penis in and out, baby out). The gastrointestinal tract is designed to be one-way, with an opening on each end. Food goes in the mouth, and the brown stuff goes out the butt. Friction, trauma damages anus and rectum.
Answered 6/27/2016
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