tathā parikṣīṇavapuṣo 'pyayonirsaumanaskārabahulasya puṃsas tiryaggatasya ca kasyacid apacitaparimāṇasyāpyatīva rāgādidarśanāt /
And because intense passion etc. is observed even in humans and animals with emaciated bodies who lack opportunities for sexual pleasures and such enjoyments.