Weak bowel muscle?: Masturbation of the penis alone does not usually affect bowel function, so you can rest easy about that. If your masturbation involves inserting things into your rectum, though, this can affect your anus. Depending on what was used and the vigor of activity, the anus and rectum can be damaged. If this possibility exists, please see your physician for an exam and any help which may be needed.
Answered 9/19/2015
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