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Polly Toynbee on her new book An Uneasy Inheritance: My Family and Other Radicals

Woman's Hour

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The Evolution of Masturbation

There's not been a huge amount of research on the evolution of masturbation at all. In females, as females become aroused, the vagina becomes a lot less acidic. It might also be a way of flushing out inferior sperm in the vaginal canal. And finally, masturbation with orgasm might help females because the contractions are associated with that can transfer those sperm through the uterine cavity.

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