古人的性交规则探奇

洞玄子，姓名里贾，生平年代均不祥．其书从丹波康赖《医心方》中辑出，首尾连贯，似为完整．洞玄子自言曰：‘至于玄女之法，传之万古，都具陈其梗概，仍末尽其机微．余每览其条，思补其阙，综习旧仪，纂此

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