The time that is most auspicious for sexual intercourse for a woman with her husband. In ancient India certain days were prescribed as the best period for women to become pregnant. This period is called ऋतुकाल . (Ṛtu--Menstruation. Kāla--time, period.)

The sixteen days following menstruation are supposed to be good; but the first three days are not very good and it is advisable not to have sexual intercourse during those days. The next even days beginning with the fourth day (4th, 6th, 8th, 10th, 12th, 14th and 16th) are the best days for coitus if a male issue (a son) is desired. The odd days (5th, 7th, 9th, 11th 13th, 15th) are to be preferred if a female issue (daughter) is desired. (Agni Purāṇa, Chapter 151) .