Manusmriti

siva.sh/manusmriti/9/70

यथाविध्यधिगम्यैनां शुक्लवस्त्रां शुचिव्रताम् । मिथो भजेता प्रसवात् सकृत्सकृद् ऋतावृतौ ॥ ७० ॥

sanskrit

Having, according to the rule, espoused her (who must be) clad in white garments and be intent on purity, he shall approach her once in each proper season until issue (be had).

english translation

yathAvidhyadhigamyainAM zuklavastrAM zucivratAm | mitho bhajetA prasavAt sakRtsakRd RtAvRtau || 70 ||

hk transliteration by Sanscript