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.

This story is part of a week-long series on reproduction, from prenatal testing to childfree Reddit. Reproduction is messy. The genetic swaps and recombinations that occur when gametes merge don't ...

Are you familiar with asexual animals? Asexual animals reproduce without involving sex or traditional fertilization. While this might sound strange, it’s actually quite natural—and even helps many ...