2. Nīvaraṇappahānavagga 11
“Nāhaṁ, bhikkhave, aññaṁ ekadhammampi samanupassāmi yena anuppanno vā kāmacchando uppajjati uppanno vā kāmacchando bhiyyobhāvāya vepullāya saṁvattati yathayidaṁ, bhikkhave, subhanimittaṁ. Subhanimittaṁ, bhikkhave, ayoniso manasi karoto anuppanno ceva kāmacchando uppajjati uppanno ca kāmacchando bhiyyobhāvāya vepullāya saṁvattatī”ti.
The Chapter on Giving Up the Hindrances 11
“Mendicants, I do not see a single thing that gives rise to sensual desire, or, when it has arisen, makes it increase and grow like the feature of beauty. When you apply the mind irrationally to the feature of beauty, sensual desire arises, and once arisen it increases and grows.”