puṁsaḥ striyāṁ striyāḥ puṁsi saṁbhogaṁ prati yā spṛhā
puṁsaḥ striyāṁ striyāḥ puṁsi saṁbhogaṁ prati yā spṛhā |
sa śṛṅgāra iti khyātaḥ krīḍā-raty-ādi-kārakaḥ ||
(Unknown source; cited in Vaman Shivaram Apte Dictionary)
“The desire for copulation with a man in a woman and with a woman in a man is called śṛṅgāra and is the cause of amorous play, sexual pleasure, and so on.”