Charak Samhita
मज्जप्रदोषात् शुक्रस्य दोषात् क्लैब्यमहर्षणम्। रोगि वा क्लीबमल्पायुर्विरूपं वा प्रजायते॥१८॥
caused due to vitiation of majja dhatu. [Diseases due to vitiation of shukra dhatu] Due to vitiation of shukra dhatu, the person becomes sexually impotent, suffers from aharshana (inability to penetrate despite erection), and may have sick, impotent, and short-lived children with congenital abnormalities.
english translation
majjapradoSAt zukrasya doSAt klaibyamaharSaNam। rogi vA klIbamalpAyurvirUpaM vA prajAyate॥18॥
hk transliteration by Sanscript