A husband or wife did not have the right either to demand sex from his or her spouse or to refuse it, and there was a catalog of forbidden sexual practices, notably homosexuality, bestiality, certain sexual positions, masturbation, the use of aphrodisiacs, and oral sex, which could incur a penance of three years’ duration. Nor were people to make love on Sundays, holy days, or feast days, or during Lent, pregnancy, or menstruation. People believed that if these rules were disobeyed, deformed children or lepers might result.

Eleanor of Aquitaine: A Life