Astanga Hrudaya
नमस्कारपरायास्तु शूद्राया मन्त्रवर्जितम्। अवन्ध्य एवं संयोगः स्यादपत्यं च कामतः॥२८॥
by doing this rite and after copulation, the woman will not remain sterile (the ritual will not become futile) and the couple will beget a son of their liking.
english translation
namaskAraparAyAstu zUdrAyA mantravarjitam। avandhya evaM saMyogaH syAdapatyaM ca kAmataH॥28॥
hk transliteration by Sanscript