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09:41 Aug 7, 2004
English to Japanese translations [Non-PRO] Science - Psychology / human anatomy
Explanation: In reference to both men and women, Mark's answer オナニー（Onnani）would work. The term マスターベーション is a term that I've seen in Japanese print. More terms are available for male masturbation. These are closer to something like 'beat off' or 'jack off':
千摺り（せんずり）をかく （Senzuri wo kaku）
シコシコする （shikoshiko suru）
There is also a term 自慰, (Jii) which is more like 'self-stimulation'
Hope this helps.
I went to Highschool in Japan. This topic came up too frequently among my classmates.
Troy Fowler United States Local time: 02:19 Native speaker of: English