The idea that 'preaching the Gospel' has nothing to do with sex and that 'preaching about sex' has nothing to do with the Gospel betrays layers and layers of seriously misguided thinking. When we divorce God's love from sexual love, as Pope Benedict says, 'the essence of Christianity' becomes 'decisively cut off from the complex fabric of human life.'
Christopher WestThe Church's basic moral principle regarding reproductive technologies is this: if a given technology assists the marital embrace in achieving its natural end, it can be morally acceptable, even praiseworthy. However, if it replaces the marital embrace as the means by which the child is conceived, it's not in keeping with God's design.
Christopher West