Viyahapannatti 2.5.129

2.5.129

mehuṇaṇṇaṃ bhaṃte! sevamāṇassa kerisae asaṃjame kajjaī?
goyamā! se jahānāmae kei purise rūyanāliyaṃ vā būranāliyaṃ vā tatteṇaṃ kanaeṇaṃ samabhiddhaṃsejjā, erisaeṇaṃ goyamā! mehuṇaṃ sevamāṇassa asaṃjame kajjai|
sevaṃ bhaṃte! sevaṃ bhaṃte! jāva viharai|

"Venerable Sir, of what kind is the non-restraint committed by one engaging in copulation?"
"Gautama, just as a man might burn through a reed tube filled with cotton or a reed tube filled with fungus using a heated iron [rod], such, Gautama, is the non-restraint committed by one engaging in copulation."
"So it is, Venerable Sir! So it is, Venerable Sir!" [Gautama said,] up to and continued to dwell.