God's first instruction to the male and female was, "Be fertile and multiply." (Gn.1:27,28). God settled the man in the garden to care and cultivate it with a suitable partner. (Gn. 2:15, 18) The man and his wife were naked, yet they felt no shame. (Gn. 2:25) This was God's invitation to discover the miracle and mystery of human sexuality.
God said, "I will place my law within them, and write it upon their hearts." (Jer. 31:33) When we look at others according to the law written in our hearts, we see with the eyes of love. When selfish lust clouds our thoughts and actions, we deny God, sinning not only against a divine image of God but also against our own self.
Human sexuality is not sinful. It is willful sexual abuse that goes against the law God has written in our hearts, whether that abuse is heterosexual, homosexual or self abuse. Our task is to teach our children about human sexuality according to the law God has written in our hearts.
Paz y Bien, Rolando, OSF