Marriage between a man and woman is ordained of God

"Marriage between a man and a woman is ordained of God and that the family is central to the Creator’s plan for the eternal destiny of His children.

The first commandment that God gave to Adam and Eve pertained to their potential for parenthood as husband and wife. 

We declare that God’s commandment for His children to multiply and replenish the earth remains in force. 

We further declare that God has commanded that the sacred powers of procreation are to be employed only between man and woman, lawfully wedded as husband and wife".

The Family, A Proclamation to the World