According to the Margaret Sanger Papers Project, Sanger conducted "a series of affairs with several men, including Havelock Ellis and H.G. Wells".<ref>[https://www.nyu.edu/projects/sanger/aboutms/ Biographical Sketch]</ref>
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According to the Margaret Sanger Papers Project, Sanger conducted "a series of affairs with several men, including Havelock Ellis and H.G. Wells".<ref>[https://www.nyu.edu/projects/sanger/aboutms/ Biographical Sketch]</ref> Her affair with [[H. G. Wells]]<ref>[https://books.google.com/books?id=63q8TpP0wtUC&pg=PA170 Radical Womanhood: Feminine Faith in a Feminist World]</ref> is probably the most well known, however she is also known to have had affairs with Herbert Simonds,<ref>[http://scholarworks.calstate.edu/bitstream/handle/2148/74/Gross.pdf?sequence=1 MARGARET SANGER: FEMINIST HEROIN
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E, PUBLIC NUISANCE, OR SOCIAL ENGINEER?], California State University</ref> Harold Hersey,<ref>[https://books.google.com/books?id=vNkTEWUQXIcC&pg=PA494 Woman of Valor: Margaret Sanger and the Birth Control Movement in America]</ref> and Angus Macdonald.<ref>[https://books.google.com/books?id=yngbAQAAMAAJ The Selected Papers of Margaret Sanger: Birth control comes of age, 1928-1939]</ref>
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Her affair with [[Havelock Ellis]] probably had the most immediate devastating effect. Sanger first met Ellis in December of 1914, and just a few weeks later they were sending each other passionate letters.<ref name=edith>[https://books.google.com/books?id=aNn_AwAAQBAJ&pg=PA94 The Birth Control Movement and American Society: From Private Vice to Public Virtue]</ref> One letter read "I still love all that I have loved, and even if I loved another I should still love you". Ellis' wife Edith was on a speaking tour in America when Havelock mentioned Margaret to her in correspondence. Edith suffered both a physical and nervous breakdown and returned to England.
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She passed away the following year.<ref name=edith />