What does “Why choose” mean in books?

It is also called reverse harem, though many readers and authors prefer the broader why-choose label.

What it does—and does not—tell you

Why choose describes the relationship structure, not a love triangle waiting for a single winner. It does not tell you whether the relationships are equally developed, or how explicit the book is.

Use it when choosing a book

When browsing a why-choose shelf, check which relationships continue at the ending and whether the description supports multiple partners rather than multiple competing suitors.