"The law of God, as quite plainly expressed in woman's construction is this: There shall be no limit put upon your intercourse with the other sex sexually, at any time of life. The law of God, as quite plainly expressed in man's construction is this: During your entire life you shall be under inflexible limits and restrictions, sexually. During twenty-three days in every month (in absence of pregnancy) from the time a woman is seven years old till she dies of old age, she is ready for action, and competent. As competent as the candlestick is to receive the candle. Competent every day, competent every night. Also she wants that candle - yearns for it, longs for it, hankers after it, as commanded by the law of God in her heart."

Source: Mark Twain (1994). “Tales, Speeches, Essays, and Sketches”, p.272, Penguin