Pardon the irony, but it's no secret that menstruation is a big secret in India. Not only do women have to find creative ways to hide this 'shame' from men, but the lack of education and information on this issue means that girls starting puberty often do not know why they menstruate. Women of India: be surprised to know that some of these issues are not unique to India -- menstruation is also a taboo in the West.
Sanitary products are taxed in the UK (it's dubbed the "tampon tax") like any luxury item, despite the fact that the government's healthcare service (NHS) provides free contraception and flat-fee medication which is free for the most vulnerable. This is based on the idea that no-one should fall below a certain standard. Yet there is no state provision for even the poorest menstruating women, and homeless women have to rely on charities to meet sanitary needs. The issue is not just at the top, it is deep-rooted in social attitudes -- such as a refusal to discuss this issue -- which then influence policy and taxation.