MĀSAVRATOPAVĀSA Purāṇas mention about the months in which Vratas are to be observed with efficacy and the details are given below:
(1) He who fasts for half a day in the month of Tulām will get children and vehicles in plenty and would become pure.
[Śloka 29, Chapter 106, Anuśāsana Parva] .
(2) He who fasts the whole day of the Dvādaśī in Tulām and worships Viṣṇu will get the benefit of making a Sahasragodāna (giving away thousand cows as gift).
[Śloka 3, Chapter 106, Anuśāsana Parva] .
(3) He who fasts for one time of the day in Vṛścikam will become a very brave and valorous man and acquire many wives and fame.
[Śloka 30, Chapter 106, Anuśāsana Parva] .
(4) All men and women who worship Viṣṇu on the dvādaśī day in Vṛścikam fasting for the whole day will get the benefit of a Godānayajña.
[Śloka 14, Chapter 109, Anuśāsana Parva] .
(5) He who fasts for one time a day during the month of Meṣa will get gold, diamonds and pearls in plenty and will be born in a high family in his next birth.
[Śloka 23, Chapter 106, Anuśāsana Parva] .
(6) If one fasts the whole of the Dvādaśī day in the month of Meṣa one would get the benefit of conducting a Puṇḍarīka.
[Śloka 7 Chapter 109, Anuśāsana Parva] .
(7) He who fasts for one time in a day in the month of Mithuna will become very prosperous.
[Śloka 25, Chapter 106, Anuśāsana Parva] .
(8) If one fasts the whole day and night of the Dvādaśī in Mithuna and does Trivikrama pūjā one would not only get the benefit of conducting a Gomedayajña but will be able to enjoy sexual pleasures with celestial maidens.
[Śloka 9, Chapter 109, Anuśāsana Parva] .