Shiva Purana
वायुरुवाच ॥ यदा पुनः प्रजाः सृष्टा न व्यवर्धन्त वेधसः ॥ तदा मैथुनजां सृष्टिं ब्रह्मा कर्तुममन्यत ॥ १ ॥
Vāyu said:— When the creation of Brahmā did not multiply Brahmā thought of creation by the process of sexual intercourse.
english translation
vAyuruvAca ॥ yadA punaH prajAH sRSTA na vyavardhanta vedhasaH ॥ tadA maithunajAM sRSTiM brahmA kartumamanyata ॥ 1 ॥
hk transliteration by Sanscript