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每次性交后,我都要清洗外阴,可是为什么避孕会失败呢?人们一般认为,性交后清洗阴部主要是为了清洁。清洗法分为坐浴法、抽吸筝
After each sexual intercourse, I have to clean the vulva, but why contraception will fail? People generally believe that sexual intercourse to clean the genitals is mainly for cleaning. Cleaning method is divided into bath law, pumping zither