God looked on his creation and was pleased. Particularly good was the ability for creation, to develop and evolve through a reproductive capability. Because of the special human attributes, including free will, human sexuality is a special gift and blessing.
In its most profound expression within marriage it has the potential to mirror the unity of God-love as well as its creative power. That may be the ideal, but it is poorly presented and understood, as sex and sexuality are still often a taboo subject. At the same time the consequences of sin, e.g. disobedience, i.e. the Fall of our first parents (Genesis and other creation accounts) have resulted in situations that are less than ideal, and sex and sexuality are too often abused.
In every aspect of creation too there are anomalies that allow mutation and growth, or change and breakdown in systems. Can one say that changing gender differences could be a consequence of this? Should such differences be recognized and accepted or rejected? Different schools of thought exist on this.
Every human person must learn with perseverance and consistency the meaning of his or her body. Sexuality is not a means of gratification or entertainment it is an interpersonal language wherein the other is taken seriously in his or her sacred and inviolable dignity. AL151,
An appreciation of our body as male or female is also necessary for our own self-awareness in an encounter with others different from ourselves. In this way we can joyfully accept the specific gifts of another man or woman, the work of God the Creator, and find mutual enrichment. Only by losing the fear of being different can we be freed of self-centredness and self-absorption. AL285. LS155