Bhagavatapurana 11.8.13

11.8.13

padāpi yuvatīṃ bhikṣur na spṛśed dāravīm api /
spṛśan karīva badhyeta kariṇyā aṅga-saṅgataḥ //

13. The sage, leading an ascetic life, should not touch even with his foot a youthful woman, even if it be a wooden doll; if he should, he would get himself fettered like the elephant brought in contact with a she-elephant.