One verse

Srimad Bhagavatam 9.9.25

9.9.25

राक्षसं भावमापन्न: पादे कल्माषतां गत: । व्यवायकाले दद‍ृशे वनौकोदम्पती द्विजौ ॥ २५ ॥

raksasam bhavam apannah pade kalmasatam gatah vyavaya-kale dadrse vanauko-dampati dvijau

raksasam
man-eating
bhavam
propensity
apannah
having gotten
pade
on the leg
kalmasatam
a black spot
gatah
obtained
vyavaya-kale
at the time of sexual intercourse
dadrse
he saw
vana-okah
living in the forest
dam-pati
a husband and wife
dvijau
who were brahmanas.

Saudasa thus acquired the propensity of a man-eater and received on his leg a black spot, for which he was known as Kalmasapada. Once King Kalmasapada saw a brahmana couple engaged in sexual intercourse in the forest.