The Source of Much of Catholic Mortal Theology and the Church's

The source of much of Catholic mortal theology and the Church's position on sex and related issues was formed in the middle ages in the writings of St.Thomas Aquinas who believed that sex

A) in all its forms was basically evil.
B) was intended for procreation which was a reflection of natural law.
C) was approved of outside of marriage for the husband,but not the wife.
D) in its non-procreative forms does not really violate natural law,but that they should be avoided.