Indecency, vulgarity, obscenity -- these are strictly confined to man; he invented them. Among the higher animals there is no trace of them. They hide nothing. They are not ashamed.
Source: Letters from the Earth.
-- Mark Twain, (Nov 30 1835-1910), US novelist, journalist, river pilot; The Great American humorist was also known as The People's Author and creator of Tom Sawyer and Huck Finn.