Shiva Purana
ततः प्रभृति विप्रेन्द्र प्रजा मैथुनसंभवाः ॥ संकल्पाद्दर्शनात्स्पर्शात्पूर्वेषां सृष्टिरुच्यते ॥ ५०॥
O great brahmin, the subjects thereafter were born of sexual union. The creation prior to this was through mental concepts, visualisation and touch.
english translation
tataH prabhRti viprendra prajA maithunasaMbhavAH ॥ saMkalpAddarzanAtsparzAtpUrveSAM sRSTirucyate ॥ 50॥
hk transliteration by Sanscript