[DocWatson]

See my .sig for links, plus this post on hentai review sites and loplop's list.

What I personally recommend (N.B.: "Web pages" may contain spoilers):

• Akiba Girls (volume 2; Web pages 1 and 2; ANN Encyclopedia entry)
• Angel Blade (volume 2; ANN Encyclopedia entry)
• Angel Blade Punish! (sequel; ANN Encyclopedia entry)
• Another Lady Innocent (ANN Encyclopedia entry)
• Bible Black (volumes 2 (eps. 3 & 4) and 4 (eps. 5 & 6); ANN Encyclopedia entry)
• Bible Black Origins (prequel; volume 3 overall; ANN Encyclopedia entry)
• Bible Black Only (erotic side stories; ANN Encyclopedia entry)
• Bible Black: New Testament (sequel; volume 2 (contains eps. 3 & 4, plus 1 & 2 subbed only) and volume 3 (eps. 5 & 6); ANN Encyclopedia entry)
• Body Transfer (ANN Encyclopedia entry)
• Boin (volume 2; Web pages 1 and 2; ANN Encyclopedia entry)
• Boobalicious (volume 2 (ep. 4—episodes 1 & 2 remain unreleased in R1); Web pages 1 and 2; ANN Encyclopedia entry)
• Consenting Adultery (ANN Encyclopedia entry)
• Desperate Carnal Housewives (volume 2; Web pages 1 and 2; ANN Encyclopedia entry)
• Discipline: The Hentai Academy (volumes 2 and 3; Web site; ANN Encyclopedia entry)
• G-spot Express (ANN Encyclopedia entry)
• G-taste (volume 2; Web pages 1 and 2; ANN Encyclopedia entry)
• The Hills Have Size (ANN Encyclopedia entry)
• Immoral Sisters (ANN Encyclopedia entry)
• Immoral Sisters 2 (the direct sequel; ANN Encyclopedia entry)
• It's a Family Affair (volume 2; Web pages 1 and 2; ANN Encyclopedia entry)
• Koihime (two volumes; out of print)
• Kite Uncut (ANN Encyclopedia entry)
• Lingeries (three volumes, out of print)
• Maple Colors (Web page; ANN Encyclopedia entry)
• Mezzo Forte Uncut (ANN Encyclopedia entry)
• Midnight Sleazy Train (ANN Encyclopedia entry)
• Midnight Sleazy Train Track 2 (Complete Collection of both series; ANN Encyclopedia entry)
• Moonlight Lady (volumes 2, 3, and the Complete Collection; ANN Encyclopedia entry)
• Parade Parade (ANN Encyclopedia entry)
• My Fair Masseuse (on The Best of Kitty Volume 3)
• The Roommate (volume 2; Web pages 1 and 2; ANN Encyclopedia entry)
• Sex Demon Queen (ANN Encyclopedia entry)
• Sex Ward (Web page; ANN Encyclopedia entry)
• Sexfriend (ANN Encyclopedia entry)
• Slave Nurses (ANN Encyclopedia entry)
• Spa of Love (volume 2; Web pages 1 and 2; ANN Encyclopedia entry)
• The Story of Little Monica (Web page; ANN Encyclopedia entry)
• Swallowtail Inn (ANN Encyclopedia entry)
• Taboo Charming Mother (volumes 2, 3, 4, 5, and 6; Web pages 1, 2, 3, 4, 5, and 6; ANN Encyclopedia entry)
• Tokyo Private Police (ANN Encyclopedia entry)
• Viper GTS (ANN Encyclopedia entry)
• Wife Eater (ANN Encyclopedia entry)
• Wife With Wife volume 1 (Web page; ANN Encyclopedia entry)
• Wife With Wife volume 2 (a different story; Web page)
• Women at Work (ANN Encyclopedia entry)

Note that a number of the above contain a fair bit of rape, but IMHO all contain sexy girls/women having sex and liking it (sometimes despite themselves). Other possibilities include Angels in the Court, Angelium, and Forbidden Love. For more screenshots, see AniSearch.de, ManiaxDVD, and SaSaMedia.