yuri

Other names: 百合, ユリ, レズ, 社会人百合, レズレイプ, 創作百合, 百合キュア, オリジナル百合, sapphic, にょたゆり, ウマ娘百合ティーダービー, 百合キュア推進委員会, pkmn百合, 백합, lesbian, wlw, 百合セカ, ポニ百合, ケモ百合, ガールズラブ, 百合キス, ホロ百合, 女同性恋, 女同, フレネミー百合, 百合3000users入り, レズールアーン

Any romantic or sexual interaction between female characters, mutual or not. If it's mutual, consider adding the couple tag.

For Danbooru purposes, futanari is not yuri. Use futa with female or futa with futa instead.

For Danbooru purposes, bisexual female activity is also not yuri. Use bisexual female instead.