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In page Marie Stopes:
"The free clinic was open to all married women for knowledge about reproductive health. Stopes tried to discover alternatives for families and increase knowledge about birth control and the reproductive system. Options included the cervical cap—which was the most popular—coitus interruptus, and spermicides based on soap and oil.[11] Stopes rediscovered the use of olive oil-soaked sponges as an alternative birth control. Olive oil's use as a spermicide dates to Greek and Roman times. Her recipe proved very effective.[12] She tested many of her contraceptives on patients at her clinics.[citation needed]
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