Shiva Purana
तदाप्रभृति लोकेऽस्मिन्स्त्रिया भागः प्रकल्पितः ॥ आनन्दं प्राप स विधिः सृष्टिर्जाता च मैथुनी ॥ २९ ॥
Ever since then, the section of women created in the world, Brahmā attained bliss. Creation became copulatory.
english translation
tadAprabhRti loke'sminstriyA bhAgaH prakalpitaH ॥ AnandaM prApa sa vidhiH sRSTirjAtA ca maithunI ॥ 29 ॥
hk transliteration by Sanscript