Charak Samhita
ऋजोः सुखोपविष्टस्य हृष्टे मेढ्रे घृताक्तया। शलाकयाऽन्विष्य गतिं यद्यप्रतिहता व्रजेत्॥५४॥
the erect penis probed with a shalaka (metallic probe) duly lubricated with ghee and if found to be unobstructed,
english translation
RjoH sukhopaviSTasya hRSTe meDhre ghRtAktayA। zalAkayA'nviSya gatiM yadyapratihatA vrajet॥54॥
hk transliteration by Sanscript