Humans don’t have a defined mating season like deer or wolves. Here’s how evolution blended biology, culture and social life into year-round intimacy.

The human genome is a rich, complex record of migration, encounters, and inheritance written over thousands of millennia.

Geneticists have a better understanding of how prehistoric pairings unfolded, with new research suggesting they were mostly between male Neanderthals and female humans.

Biological anthropologists and evolutionary psychologists commonly take it for granted that human monogamy has a biological basis. Desmond Morris was an influential early advocate. His 1967 ...