"Sloths are not strictly monogamous and have a mating system that combines polygyny and promiscuity:
Copulation
Copulation lasts less than a minute.
Dominant male
After copulation, the dominant male stays nearby for several days, mating with the female frequently and fighting off other males.
Female sloths
Female sloths scream in D-sharp to get the attention of males. They often mate with multiple males over their lifetime.
Three-toed sloths
Three-toed sloths exhibit strong polygyny, where certain males mate with many females and father the majority of offspring.
Two-toed sloths
Two-toed sloths appear to have weak polygyny and strong female promiscuity.
Scent marking
Both males and females mark their scent by rubbing their anal glands against tree branches to send messages about their reproductive status.
Fighting
Males will fight over access to the female by biting, swiping their claws, and holding on to each other. "
