1,075. A Presumption of Cleanliness

154:4 Some women start their periods on a given day or at a regular interval accompanied by one of the physical symptoms. For example, on the fifth day of every month, she yawns or sneezes and afterwards she sees blood, or this happens every 25 days. This is called "veses hamurkav" - a mixed pattern - because it combines a time with a symptom. The combination must occur three times, that is, when her regular time arrives and she experiences the symptom, she should expect her period. However, the day itself or the symptom itself need not concern her as her pattern is dependent upon both factors combined.

154:5 Every woman who has a regular period is assumed to be clean at other times and her husband may have relations with her without inquiring as to her status. Even if she is sleeping lightly, he can initiate and she need not check herself for blood, neither before or after engaging in marital relations. Quite the opposite - she specifically should not check herself in front of her husband so that he shouldn't be concerned by worrying that she wouldn't have checked if she hadn't felt something. If she checked in his presence before having relations, it is likely that this would concern him and he would refrain. If she checked in his presence after having relations, he might be worried that she felt something during the act and he may refrain in the future. Therefore, she should not check herself in her husband's presence. Not in her husband's presence, however, it is praiseworthy for a woman to be diligent about checking herself.