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The hemorroidal vein.
hemorrhoids
No, anal is mostly for a guys pleasure.
Yes it can cause bleeding
Pressure.
Honestly, it isnt. Its a waste of time
Pressure
No it isnt bigger in population and land area.
Rectal examination is performed by means of inserting a gloved, lubricated finger into the rectum and palpating (feeling) for lumps
Air pressure.
air
Undigested material goes to the large intestine, toward the rectal area.