The Torah prohibits sexual relations between a husband and wife during niddah, as well as other forms of intimate physical expression, such as hugging and kissing. Intimate touch is forbidden from the Torah. Chazal added a series of restrictions, called harchakot, on the conduct of a couple during the time of niddah. These restrictions are based on halachic and psychological reasons, and serve to prevent a couple from engaging in a way which is heavy with romantic and intimate overtones, which can lead one to intimacy and the transgression of a Torah prohibition.
Harchakot must be kept the entire time one is niddah, both during the days of the period itself and during shivah neki’im, whether she became niddah from an actual period or from a ketem.