Here's my Yuri list as it stands:
In Japanese: 百合 ("yuri"—"lily"); レスビアン ("rezubian"); レス ("rezu")
Series in the list contain at least one female/female scene.
- After Class episode 3
- Akiko
- Alien from the Darkness
- Angel Blade / Angel Blade Punish!
- Another Lady Innocent
- Arisa
- Beat Angel Escalayer episodes 1 and 3
- Bible Black: Only
- Bible Black Origins
- Black Gate
- Blood Shadow
- Body Transfer
- Cage
- Chains of Lust
- Chu2 / Twisted Tales of Tokyo
- Consenting Adultery episode 2 (tribadism, brief; male present)
- Cool Devices
- Ep. 1 "Curious Fruit"
- Ep. 2 "Sacred Girl"
- Ep. 3a "Lover Doll"
- Ep. 9 "Slave Warrior Maya 2"
- Ep. 10 "Binding"
- Countdown
- Ep. 3b "Famous Trick History, Hooligan Boy"
- Countdown to Delight (on Kitty Pleasure Pack #2)
- Crimson Climax
- Dark Love episode 1
- Darling episode 3
- Discipline: The Hentai Academy
- él
- Elfina: Servant Princess
- Enspelled (both episodes)
- Erotic Torture Chamber (on The Best of Kitty Vol. 4)
- F3: Frantic, Frustrated and Female
- Flashback (AKA Flashback Game)
- Genmukan: The Sin of Desire & Shame
- Girl's Locker Room Lust
- Gloria: Private Lessons
- G-Taste
- Guy episode 1 ("Awakening of the Devil"; brief)
- Heartwork episode 2 (twice; brief; male present) and episode 3 (twice; brief; male present)
- Holy Virgins episode 1
- Horny Ladies and the News episode 2
- Immoral Sisters / Immoral Sisters 2
- Inmu
- Ep. 2a "Inside of the Water"
- It's a Family Affair episode 2e (implied rather than shown)
- Kamyla
- Karakuri Ninja Girl
- Karen
- Leatherman episode 4 (?)
- Lesbian Ward episodes 1 (thrice; males present for second scene, and participate in third) and 2 (several match-ups)
- Like Mother, Like Daughter
- Love Doll episode 3
- Maison Plaisir episode 2 (various scenes, male sometimes present/joining in)
- Masquerade episodes 1 and 2 (brief)
- Medical Humiliation (male present for one scene)
- Midnight Sleazy Train Track 2
- Moonlight Lady
- Mystery of the Necronomicon episode 3
- Night When Evil Falls, The (technically…)
- Nymphs of the Stratosphere
- Oni-Tensei
- Parade Parade
- Private Psycho Lesson
- Private Sessions
- Private Sessions 2
- Punishment episode 1
- Pure Love
- Rei Rei
- Ringetsu episode 3
- School of Darkness episode 1, and episodes 2 & 3 (separate stories)
- School of Masochists / School of Bondage episode 3
- Sex Craft episode 1 (brief)
- Sex Demon Queen
- Sex Taxi episodes 1 (brief) and 4 (a threesome and a pair; non-consensual; male present)
- Sex Ward
- Sex Warrior Pudding episode 2
- Sexfriend
- Sextra Credit
- Shojyo Koakuma Kei: The Writhing Women
- Sin Sorority
- Slave Nurses
- Slaves to Passion episode 2
- Slight Fever Syndrome
- Stainless Night
- Temptation episodes 1 and 2
- Twin Angels episode 3 or 4
- Variable Geo Neo episode 3
- Venus Files, The episode 2 (non-consensual (under the influence of mind control and an aphrodesiac))
- Viper GTS
- Weather Report Girl (etchi)
- Words Worth: Outer Story
Region 2:
- Bodyjack
- Cream Lemon (The "Escalation" arc, Pop Chaser, Star Trap, plus others)
- Reinou Tantei Miko
This list may not be definitive (though I hope to make it so with your help); what did I miss, and what needs correction?