Charak Samhita
नराश्चटकवत् केचिद् व्रजन्ति बहुशः स्त्रियम्। गजवच्च प्रसिञ्चन्ति केचिन्न बहुगामिनः ॥६॥
There are some persons who indulge in sex very frequently like a sparrow and some others who are not mating frequently but ejaculate huge amount of semen during sexual activity.
english translation
narAzcaTakavat kecid vrajanti bahuzaH striyam। gajavacca prasiJcanti kecinna bahugAminaH ॥6॥
hk transliteration by Sanscript