The subject of menstruation is filled with powerful socio-cultural implications involving language, religion and gender relations. Yet, the topic is often relegated to silence, considered taboo, and strongly associated with impurity and shame. This schism between the natural reality of menstruation and its socio-cultural damnation highlights the marginal and oppressed condition of women who are considered inferior and impure in many cultures and religions for the mere fact of menstruating, despite ancient practices that validated and celebrated women’s menarche. The multimedia project 13 lunas 13/13 moons 13 allows for the interactive exploration of these themes while reflecting upon the patriarchal foundations of the taboo of menstruation. This essay examines primarily the video 13 lunas 13, a video of testimonies by thirteen Spanish women form different generations and social backgrounds. Fear, shame, lack of sexual agency, are some of the common experiences expressed by the women interviewed, particularly among older generations. Along with these testimonies on sexuality and menstruation, this project seeks to collect and reveal euphemisms, myths and cultural practices that are being erased by global practices, while pointing to new technologies and attitudes towards menstruation. Other variables of this project include art installations, poetry, and an interface that allows the collection of testimonies via the Internet, reaching out to new generations of men and women wishing to expose an experience intrinsically related to their lives.