ऋतुः स्वाभाविकः स्त्रीणां रात्रयः षोडश स्मृताः । चतुर्भिरितरैः सार्धमहोभिः सद्विगर्हितैः ॥ ४६ ॥
Sixteen (days and) nights (in each month), including four days which differ from the rest and are censured by the virtuous, (are called) the natural season of women.
english translation