Had the 13th century monk and Catholic theologian/philosopher Thomas Aquinas written a book on sex, it would've been called 'The Joy of Celibacy'. Here are his views on sex, which have been alarmingly influential on Catholic ethics to this day...
THOMAS AQUINAS' GUIDE TO SEXUAL MORALITY
ABOMINATION AGAINST NATURE!
RAPE: AT LEAST IT LEADS TO PROCREATION
INCEST: BROADLY IN LINE WITH GOD'S WILL
WELCOME TO BROMYARD
SEXUAL INTERCOURSE PERFORMED WITH AS LITTLE ENJOYMENT AS POSSIBLE WHILE PRAYING TO GOD FOR FORGIVENESS: