First French association for the fight against menstrual precariousness, Elementary Rules collects periodic protections for the most deprived and breaks the taboo of menstruation. Together, we can change the rules! Basic Rules is an association law 1901 which collects products of intimate hygiene for the homeless women or in situation of badly housed in order to help them to protect themselves and to find their dignity. We want to educate all audiences and break the taboo of the rules, in particular by involving boys!