What does the statement in red mean in context? Thank you!!
Only natural marital relations (natural genital-to-genital intercourse) open to life has all three meanings: marital, unitive, and procreative. If a husband or wife are infertile, due to old age, or injury, or illness, the natural marital act remains moral because it is still the type of act which is inherently directed toward procreation (even if procreation is not attained). The essential moral nature of any act is determined by its inherent ordering toward its moral object, not by the attainment of the moral object. - catechism.cc/articles/QA.htm