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Mystery of Female Orgasm Continues to Baffle Scientists
There have been many attempts to explain the evolutionary mystery of female orgasm. One, suggested by Desmond Morris in his 1967 popular-science book "The Naked Ape," was that the female orgasm evolved to encourage physical intimacy with a male partner and helps reinforce the pair bond. Other theories are based on the idea that the female orgasm might increase fertility. For example, a 30 percent reduction in size of the vagina could help clench onto the penis which would make it more stimulating for the male. The British biologists Baker and Bellis have suggested that the female orgasm may have an "upsuck" action (similar to the esophagus' ability to swallow when upside down), resulting in the retaining of favorable sperm and making conception more likely.