It is not primarily related to Life. The doctrine involves the Church’s belief that to engage in sexual activity for mere pleasure is an act of lustful selfishness. The Church condemns all forms of masturbation. The clitoris serves no purpose in the act of propagation, yet the Church condemns female masturbation as being no less sinful than male masturbation. As for whether Catholic women are actually aware of the Church teaching, most parishes require either individual couple or group pre Cana conferences where the challenges of marriage within Church doctrine are presented. So any Catholic woman who was married in a sacramental setting has been made well aware of Church teaching on contraception.
Hopefully...
When my husband and I married in the Catholic Church pert-near exactly 25 years ago (cheers all around!) I was dismally disappointed in the marriage preparation. I had been hoping we'd be inspired and enriched by the Church's profoundly wise, divine and fully-dimensioned human point of view; this particular parish gave us almost nothing.
We have had to persistently, almost obstinately dig and work for the in-depth Catholic perspective. This we have done, to our great mutual reward.
But shame on the negligent shepherds, who, like the Pharisees of old, do not enter the gate, and block those who are trying to enter in.