Kamasutra

siva.sh/kamasutra/samprayoga/9/3

तस्या वदने जघनकर्म। तदौपरिष्टकमाचक्षते ॥ ३ ॥

sanskrit

They perform the act that takes place between the thighs in the mouth, which is why it is called superior coition.

english translation

नपुंसक के मुख में जो मैथुनकर्म किया जाता है, उसे ही औपरिष्टक कहते हैं॥ ३ ॥

hindi translation

tasyA vadane jaghanakarma| tadaupariSTakamAcakSate || 3 ||

hk transliteration by Sanscript