text: For example , recent DNA evidence suggests that pubic lice spread to humans approximately 2,000,000 years ago from gorillas .
simplified: Recent DNA evidence suggests that pubic lice spread to the ancestors of humans approximately 3.3 million years ago from the ancestors of gorillas by sharing the same bed or other communal areas with them , and are more closely related to lice endemic to gorillas than to other lice species infesting humans .