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Old 15th May 2009, 11:51 AM
Ron Conte Ron Conte is offline
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natural intercourse is immoral outside of marriage, but moral within marriage, because the moral law requires sexual relations to be

(1) marital
(2) unitive
(3) procreative

natural relations outside of marriage has only the unitive and procreative meanings; also the fullness of the unitive meaning includes marital union, which is lacking; and the fullness of the procreative meaning includes procreation within marriage (so that the children are raised by two parents).

Whenever any one meaning is lacking, the other meanings, even when present, are harmed. Contraception harms the unitive and marital meanings. Unnatural sexual acts, which are inherently non-procreative and non-unitive (in the proper sense of the word), also harm the marital meaning.

Concerning unnatural sexual acts within marriage:

[Mark 10]
{10:6} But from the beginning of creation, God made them male and female.
{10:7} Because of this, a man shall leave behind his father and mother, and he shall cling to his wife.
{10:8} And these two shall be one in flesh. And so, they are now, not two, but one flesh.
{10:9} Therefore, what God has joined together, let no man separate.

Do you think that when Christ himself described the husband and wife becoming one flesh, and being joined together by God, that he meant that the became one by an unnatural act? But creation is the definition of natural. From the beginning of Creation, God designed man and woman to be joined by the natural marital act. Marriage is essential to this act because God began the human race by creating only one man and only one woman, such that they would procreate to produce the human race.

Also, the reason that natural sexual relations outside of marriage is intrinsically evil is that it is non-marital. But unnatural sexual relations is intrinsically evil because it is non-procreative and non-unitive, therefore unnatural relations within marriage is not justified by the marriage.
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