Washing your hands after masturbating on your period.
"What, will these hands ne'er be clean?... Here's the smell of the blood still: all the perfumes of Arabia will not sweeten this little hand... Wash your hands, put on your nightgown; look not so pale... To bed, to bed, to bed!" (Lady Macbeth Lady Macbething, Macbeth, Act 5, Scene 1)
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