Majjhima Nikaya 5:71
SUJATOSo vata, bhikkhave, aññatreva kāmehi aññatra kāmasaññāya aññatra kāmavitakkehi kāme paṭisevissatīti—netaṁ ṭhānaṁ vijjati.
Truly, mendicants, it is quite impossible to perform sensual acts without sensual desires, sensual perceptions, and sensual thoughts.