Natyashastra
वामवेधस्तु कर्तव्यो विक्षेपो दक्षिणस्य च । शृङ्गाररससंयुक्तां पठेदार्यां विचक्षणः ॥ १२२॥
The left piercing should be performed, as well as the agitation of the right. One should recite the noble (verses) imbued with the essence of Śṛṅgāra (the erotic sentiment), as a wise person would.
english translation
vAmavedhastu kartavyo vikSepo dakSiNasya ca । zaRGgArarasasaMyuktAM paThedAryAM vicakSaNaH ॥ 122॥
hk transliteration by Sanscript