On our relationships and culture:

A contraceptive mentality has brought increases in divorce, unwanted pregnancy, and abortions. It also promotes sex as simply being a pleasurable recreation inducing homosexual acts and other perversions. The world needs couples to be counter-cultural! Couples ready to show the world that something even better than you can imagine is out there.

When anthropologist J. D. Unwin studied the origins and development of 80 civilizations, he discovered a profound connection between the vitality of a society and the strength of its marriages and families. He came to the realization that any society that did not direct its sexual energies toward the good of marriage and family did not last. (cf. Donald DeMarco, New Perspectives on Contraception)

The Church and the world today more than ever need married couples and families who generously let themselves be schooled by Christ. JPII

Some additional articles:

Birth-control affects long-term relationships.
The Harms of Contraception

Abortion and Contraception