Humans don’t have a defined mating season like deer or wolves. Here’s how evolution rewired our reproduction by blending biology, culture and social life into year-round intimacy. Unlike the rut of ...

Photograph of three male zebra finches (Taeniopygia castanotis), whose mating calls were used as part of the study. Credit: Raina Fan. The bright colors of butterfly wings, the sweet aromas of flowers ...