Procreation

Elder Dallin H. Oaks, Fundamental to Our Faith, Ensign January 2011
The power to create mortal life is the most exalted power God has given His children. The use of this creative power was mandated in the first commandment to “be fruitful, and multiply” (Genesis 1:28). Another important commandment forbade its misuse: “Thou shalt not commit adultery” (Exodus 20:14), and “ye should abstain from fornication” (1 Thessalonians 4:3). The emphasis we place on this law of chastity is explained by our understanding of the purpose of our procreative powers in the accomplishment of God’s plan.