Natyashastra
यत्तु संदृश्यते किञ्चिद्दम्पत्योर्मदनाश्रयम् । नृत्तं तत्र प्रयोक्तव्यं प्रहर्षार्थगुणोद्भवम् ॥ ३०६॥
When a glimpse of the union between a couple, inspired by love, is seen, dance should be performed there, arising from the quality of joy and enthusiasm.
english translation
yattu saMdRzyate kiJciddampatyormadanAzrayam । nRttaM tatra prayoktavyaM praharSArthaguNodbhavam ॥ 306॥
hk transliteration by Sanscript