A saintly person should never touch a young girl. In fact, he should not even let his foot touch a wooden doll in the shape of a woman. By bodily contact with a woman he will surely be captured by illusion, just as the elephant is captured by the she-elephant due to his desire to touch her body.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
पदापि युवतीं भिक्षुर्न स्पृशेद्दारवीमपि । स्पृशन् करीव बध्येत करिण्या अङ्गसङ्गतः
padāpi yuvatīṃ bhikṣurna spṛśeddāravīmapi | spṛśan karīva badhyeta kariṇyā aṅgasaṅgataḥ
SB 11.8.13