It isn't sex by itself that makes abortion. It is sex plus covetousness: desiring things that God does not will for us to have because we are not willing to find our satisfaction in him. Illicit sex and unencumbered freedom without children: for these we covet, and abortion is the result.
John PiperSin is what you do when your heart is not satisfied with God. No one sins out of duty. We sin because it holds out some promise of happiness.
John PiperWe do not choose suffering simply because we are told to, but because the one who tells us to describes it as the path to everlasting joy.
John Piper