The introduction of the oral contraceptive pill in the early 1960s dramatically changed many New Zealand women's lives, including that of Dame Margaret Sparrow.
Then a 26-year-old living in Dunedin, she had taken two years off from medical school to have children. Her husband, also a medical student, was on work placement at a general practice when he was approached by drug representatives.
"He came home that day and said 'Look, I've got these new free samples, maybe we should give them a try'," Dame Margaret says. "It changed our lives greatly because for the first time I could regulate fertility. It enabled me to go back to medical school."
Dame Margaret, now 78 and living in Wellington, went on to become New Zealand's leading contraception specialist and sexual health physician.
She was twice president of the pro-choice group the Abortion Law Reform Association, and worked for the Family Planning Association for more than 30 years.