Ethan Tucker. Intensive study of the topic of niddah (the set of laws and practices surrounding female uterine bleeding and sex) remains a core part of rabbinic training in many yeshivot and its practice is a central part of the sexual lives of many Jews. It is a topic that has suffered, in my view, from an excess of apologetics and evasion. My goal in this series is to lay out some of the main sources and issues in this area of law and practice, while offering honest, open and critical responses to the different ways we might approach it.