If one holds sexual union on the fifth day from the first appearance of the cataminal flow he gets a daughter. By holding it on the sixth day, he gets a son. A wise man should, in the matter of sexual intercourse attend to this rule.
पञ्चमे दिवसे नारी षष्ठेऽहनि पुमान् भवेत्॥ एतेन विधिना पत्नीमुपगच्छेत पण्डितः।