The societal acceptance of birth control required the separation of sexual activity from procreation, making birth control a highly controversial subject in some countries at some points in the 20th century.[51] Birth control also became a major theme in feminist politics; reproduction issues were cited as examples of women's powerlessness to exercise their rights.[52] Starting in the 1930s and intensifying in the '60s and'70s, the birth control movement advocated for the legalisation of abortion and large scale education campaigns about contraception by governments.[51] In a broader context birth control became an arena for conflict between liberal and conservative values, raising questions about family, personal freedom, state intervention, religion in politics, sexual morality and social welfare.[52]