Here's my "Normal" list (hentai anime which features "vanilla" sex—not "extreme" fetishes) as it stands:
- Akiba Girls
- Angels in the Court
- Another Lady Innocent
- Anyone You Can Do...I Can Do Better!
- Beat Angel Escalayer
- Body Transfer
- Boin
- Campus
- Can Can Bunny Extra
- Class Reunion Again
- Consenting Adultery
- Cosplay Cafe
- Dragon Pink
- Elven Bride
- End of Summer / End of Summer 2 (AKA Doukyuusei Natsu no Owari ni)
- Endless Serenade
- F3: Frantic, Frustrated and Female
- First Loves / First Loves 2 (AKA Kakyuusei: My Petty Classmate (sic); incomplete)
- Forbidden Love
- Girl Next Door
- Heat for All Seasons, A
- Homeroom Affairs
- I Dream of Mimi, AKA Buttobi CPU
- I Love You
- It's a Family Affair
- Karakuri Ninja Girl
- Koihime
- Lingeries
- Love is the Number of Keys
- Magical Twilight
- Mail Order Maiden 28
- Maple Colors
- Marine A Go Go
- My Fair Masseuse (on The Best of Kitty Volume 3)
- Mystery of Nonomura Hospital, The
- New Angel
- One: True Stories
- Pianist, The
- Rei Rei: Missionary of Love
- Roommate, The
- Sex Demon Queen (some rape, but it's hard to take seriously a show which features demonic Menchi's (of Excel Saga))
- Sex Warrior Pudding
- Sexfriend
- Slight Fever Syndrome
- Step Up Love Story (etchi)
- Story of Little Monica, The
- Tokyo Private Police
- Virgin Touch
- Weather Report Girl (not very explicit, but very funny)
- Welcome to Pia Carrot / Welcome to Pia Carrot 2
- Wife Eater
- Wife With Wife vol. 2
- Women at Work
Harder core:
- Countdown
- Darling
- Discipline: The Hentai Academy
- Love Lesson
- Maids in Dream
- My Brother's Wife
- Ringetsu
- Sex Ward
- Swallowtail Inn
- Virgin Auction
- Wife With Wife vol. 1 (due to the last scene)
Region 2:
- Cream Lemon:
- Shoya -Virgin Night-
This list may not be definitive (though I hope to make it so with your help); what did I miss, and what needs correction?