Every woman at some point or another will get their period- it is a coming of age, a natural, biological occurrence. And yet, to discuss it, or mention it as a woman is seen as "dirty" or "inappropriate".
In both sports and in China, the words "menstration cycle" have a negative taboo. In fact, tampon and pad commercials have been banned from playing. Furthermore, tampons are rarely sold as they are thought to "rob a girl of her virginity".