…As late as 1874, the average Anglican clergyman in England still had 5.2 living children. In 1911, however, just three years after the bishops had condemned contraception, the new census of England showed that the average family size of Anglican clergy had fallen to only 2.3 children, a stunning decline of 55 percent. The British Malthusian League—a strong advocate of contraception—had a field day exposing what it called the hypocrisy of the priests.
As the league explained, the Church of England continued to view contraception as a sin, and yet its clerics and bishops were obviously engaging in the practice. Apparently only the poor and the ignorant had to obey the church.
There was not much that Anglican leaders could say in response. This propaganda continued for another two decades, and soon some Anglican theologians were arguing that Britain’s poverty required the birth of fewer children.
Pressures culminated at the 1930 Lambeth Conference, where bishops heard an address by birth-control advocate Helena Wrighton on the advantages of contraception for the poor. On a vote of 193 to 67, the bishops (representing not only England but also America, Canada, and the other former colonies) approved a resolution stating that:
In those cases where there is such a clearly felt moral obligation to limit or avoid parenthood, and where there is a morally sound reason for avoiding complete abstinence, other methods may be used, provided that this is done in the light of the same Christian principles.