Srimad-Bhagavatam: Canto 9 - Chapter 1 - Verse 42

Sanskrit:

गन्धर्वानुपधावेमांस्तुभ्यं दास्यन्ति मामिति ।तस्य संस्तुवतस्तुष्टा अग्निस्थालीं ददुर्नृप ।उर्वशीं मन्यमानस्तां सोऽबुध्यत चरन् वने ॥ ४२ ॥

ITRANS:

gandharvān upadhāvemāṁstubhyaṁ dāsyanti mām ititasya saṁstuvatas tuṣṭāagni-sthālīṁ dadur nṛpaurvaśīṁ manyamānas tāṁso ’budhyata caran vane

Translation:

Urvaśī said: “My dear King, seek shelter of the Gandharvas, for they will be able to deliver me to you again.” In accordance with these words, the King satisfied the Gandharvas by prayers, and the Gandharvas, being pleased with him, gave him an Agnisthālī girl who looked exactly like Urvaśī. Thinking that the girl was Urvaśī, the King began walking with her in the forest, but later he could understand that she was not Urvaśī but Agnisthālī.

Purport:

Śrīla Viśvanātha Cakravartī Ṭhākura remarks that Purūravā was very lusty. Immediately after getting the Agnisthālī girl, he wanted to have sex with her, but during sexual intercourse he could understand that the girl was Agnisthālī, not Urvaśī. This indicates that every man attached to a particular woman knows the particular characteristics of that woman during sex life. Thus Purūravā understood during sexual intercourse that the Agnisthālī girl was not Urvaśī.