People in their twenties or thirties probably still remember back in junior high school when the health education teacher--blushing rosy red -- came to the part about male and female physical characteristics in chapters 14 and 15!
二、三十歲以上的民眾，大概還記得國中時，健康教育老師臉紅地略過介紹男女生理特徵的第十四、十五章情景吧！