Taboo of periods

http://www.ted.com/talks/aditi_gupta_a_taboo_free_way_to_talk_about_periods#t-17743

Such is the taboo and misconception associated with the most common biological phenomenon vital for sustaining our own species. Society teach the girls be unaware about periods to stay decent. Talking about it makes almost all uncomfortable eventhough our school syllabi has made us taught about periods. And that taboo has consequences: in India, three out of every 10 girls don't even know what menstruation is at the time of their first period, and restrictive customs related to periods inflict psychological damage on young girls.