This included Sanger's tour of Scandinavia and the Soviet Union in 1934, How-Martyn's tour of India in 1934, and Sanger and How-Martyn's World Tour for Birth Control in 1935-1936, during which they spoke to numerous groups and organized birth control organizations in India, Burma, Malay, China, the Philippines, Japan, Hawaii, Canada, and the West Coast of the United States.
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She met the American family planning leader Margaret Sanger in 1915 and had been impressed by her ideas, subsequently organising the 1927 World Population Conference in Geneva with Sanger and becoming honorary director of the Birth Control International Information Centre in London in 1930.