Shiva Purana
रसाय नायते नित्यमपथ्यमपि सेवितम् ॥ अनिशं क्रियमाणापि रतिस्त्वभिनवायते ॥ ८४ ॥
Even if he takes unwholesome food it will act as aphrodisiac. Even if he indulges in sexual intercourse everyday it will give him fresh thrills.
english translation
rasAya nAyate nityamapathyamapi sevitam ॥ anizaM kriyamANApi ratistvabhinavAyate ॥ 84 ॥
hk transliteration by Sanscript