Study Niddah folio 12B with parallel Hebrew-English text, traditional commentary, and modern study tools. Free access to Babylonian Talmud online.
Rava said to Rav Pappa: Wise one [sudani]! No, won’t she be demeaned before him? It is embarrassing for her if she is awoken and has to think about whether or not she is pure. Rav Kahana says: I asked the members of the households, i.e., the wives, of Rav Pappa and of Rav Huna, son of Rav Yehoshua
§ A baraita states: With regard to a woman who does not have a fixed menstrual cycle, she is forbidden to have sex, and she does not have the right to receive payment of her marriage contract if divorced or widowed, nor is she entitled to payment from her husband for the produce of her property tha
R' Ḥanina ben Antigonus says: She is permitted to have sex with her husband, but she must examine herself with two examination cloths, one prior to sex and one afterward. They may be to her detriment if she finds blood on the cloths, or they may lead to her betterment, since if she finds no blood
The Talmud explains each clause of the baraita: She is forbidden to have sex, as perhaps she will ruin her husband if she emits blood during sex. And with regard to the halakha that she does not have the right to receive payment of her marriage contract, the reason is that since she is not fit for
The Talmud continues its explanation: And she is not entitled to payment for the produce of her property, nor is she entitled to provisions for her sustenance from his estate, nor does she get back her worn clothes. The reason for all these is because stipulations in the marriage contract are consi