By Jessica Hamzelou. Patricia Brennan has forged a controversial career in studying the twist and turns of the evolution of animal genitalia. A biologist based at Mount Holyoke College in South Hadley, Massachusetts, her latest research suggests that bottlenose dolphins have clitorises that have evolved for pleasure — something she says makes sense given the amount of sex the animals have. Patricia Brennan: I have been collaborating with a researcher who was studying vaginas in dolphins. Dolphins have very complicated vaginas, which contain many folds. The hypothesis was that these folds were there to exclude salt water during copulation, because it is supposed to be lethal to mammalian sperm. But nobody had actually ever really studied these folds or tried to test the idea. But when we dissected the vaginas, I would look at these clitorises and be just amazed. We know that dolphins have sex all the time.
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