There are several reasons why we believe that the use of contraception harms everyone involved. The first reason is that the use of contraception leads to abortion. Several "contraceptives" are in fact abortifacients. That is, they cause early abortions. All oral contraceptives, Norplant, Depo-Provera, and IUDs cause abortions before a woman even knows she's pregnant. According to Dr. Bogomir Kuhar, in Infant Homicides Through Contraceptives, these forms of birth control take an estimated 8.1 to 12.75 million lives each year in the US alone. Contraceptives also cause abortions through their failures. All contraceptives fail, some quite often. Even surgical sterilization has a failure rate. Each "failure" results in a new human life, a new baby, an actual woman facing an unplanned and often unwanted pregnancy. These pregnancies are at risk for abortion.
The invention of the birth control pill was revolutionary and, in fact, caused the sexual revolution. Once people thought they could have sex without the possibility of pregnancy, or with a greatly reduced risk of pregnancy, they began to disregard the traditional structures that had protected children and sex for centuries. Contraceptives pills were soon prescribed for younger and younger unmarried women. Since contraceptives fail, this led to an upsurge in the numbers of out of wedlock and teenage pregnancies, and the number of single parent families. With the increase in premarital and extramarital sex, and the number of partners one person might have, the rate of infection from sexually transmitted diseases skyrocketed. Even the number of serious sexually transmitted diseases soared, from about twelve known diseases thirty years ago to over fifty today. This plague has even struck our senior citizens as, empowered by Viagra, they have contact with multiple sex partners. Several retirement communities now report epidemics of STDs. Nature is telling them that even after fertility is naturally gone, the marriage vow is still sacred. The diseases themselves have changed, from easily treatable, known diseases, to more and more destructive ones, including the AIDS virus. Some contraceptives, especially hormonal contraceptives, even make the user more susceptible to STDs.