Pet names and baby talk between lovers can be cringe-worthy and even incriminating. So why do couples use such lovey-dovey language?

Besides the infamous Number Nine, that is.

Evolutionary biology offers theories as to why some mammals engage in monogamy. And no, it's not because they're in love. (Sorry.)

Heliconian butterflies choose mates with similar wing patterns. Their genes make them do it.

Since the 1980s, more and more couples have sought therapy. Why is it so helpful to have that third person in the room?

For white, middle-class women in the 19th century U.S., courtship and marriage offered less emotional intimacy than their friendships with other women.

Well-researched stories from Aeon, Public Books, and other great publications that bridge the gap between news and scholarship.

Three states have legalized covenant marriage, which makes divorce difficult. Why didn't it stick among communities preoccupied with family values?

How romance novels—despite their decided lack of cultural clout—became big business for the publishing industry.

In a moment when scientists were working to fashion a credible identity for themselves, they had to decide how much showmanship was too much.