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The anal canal and rectum is not a natural orifice for having sexual intercourse. The mucosa of the anal canal is very delicate and vascular.
Hence when you try to introduce sharp objects within the anorectal canal, it is natural for cuts and injuries to occur and result in bleeding.
In case such injuries are not treated immediately complications like infections and strictures can occur. Damage to the external anal sphincter can cause fecal incontinence.
Hence it would be in your best interest to consult your doctor for a examination and seek proper treatment.