Not at all, I apologise, mis-understood you. There always must be a defining line. In the context of Church teaching, the losing of your virginity before marriage is a sin. That is clearly defined. Murder is also a sin (in all it's forms). I was mearly demonstrating how the Church's teaching on abortion has not changed, nor can it be since it a commandment of God and not subject to revision.
"nor can it be since it a commandment of God and not subject to revision."
Well, obivously God is allowed to revise it, according to the Bible.