One verse

Srimad Bhagavatam 5.14.31

5.14.31

तत्रापि निरवरोध: स्वैरेण विहरन्नतिकृपणबुद्धिरन्योन्यमुखनिरीक्षणादिना ग्राम्यकर्मणैव विस्मृतकालावधि: ॥ ३१ ॥

tatrapi niravarodhah svairena viharann ati-krpana-buddhir anyonya-mukha-niriksanadina gramya-karmanaiva vismrta-kalavadhih.

tatra api
in that condition (in the society of human beings descended from monkeys)
niravarodhah
without hesitation
svairena
independently, without reference to the goal of life
viharan
enjoying like monkeys
ati-krpana-buddhih
whose intelligence is dull because he does not properly utilize his assets
anyonya
of one another
mukha-niriksana-adina
by seeing the faces (when a man sees the beautiful face of a woman and the woman sees the strong build of the man’s body, they always desire one another)
gramya-karmana
by material activities for sense gratification
eva
only
vismrta
forgotten
kala-avadhih
the limited span of life (after which one’s evolution may be degrading or elevating)

In this way the descendants of the monkeys intermingle with each other, and they are generally known as sudras. Without hesitating, they live and move freely, not knowing the goal of life. They are captivated simply by seeing the faces of one another, which remind them of sense gratification. They are always engaged in material activities, known as gramya-karma, and they work hard for material benefit. Thus they forget completely that one day their small life spans will be finished and they will be degraded in the evolutionary cycle.