Yuri
Quick Definition
A genre of Japanese media focusing on intimate relationships between female characters. In hentai, it specifically refers to lesbian sexual content.
In-Depth Explanation
Yuri can range from romantic and gentle (often called "shoujo-ai" in non-explicit contexts) to highly explicit. It explores the dynamics of female-female relationships and is a popular genre with a dedicated fanbase. The use of "Toys" is common.