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The female orgasm is more of a mystery than the continued career success of Donald Trump. But new, in-depth research (literally) has found that there are three orgasmic varieties on erotic offer for us gals: a ‘wave’, a ‘volcano’ or an ‘avalanche’. James Pfaus, professor of neuroscience and psychology at Charles University in Prague, explains that the names refer to pelvic floor movements during the build-up to orgasm