You can also view a categorical version of this list via the manga fanservice compilation category.
Hyakka Ryouran (Samurai Girls)
Koko ga Uwasa no El Palacio (non-nude)
Magical Pâtissière Kosaki-chan (Nisekoi spin-off)
Prison School (aka Kangoku Gakuen)
Sakura Tsuushin (aka Sakura Diaries)
Shinmai Maou no Keiyakusha (aka Shinmai Maou no Testament)
Sorcerer Hunters (aka Bakuretsu Hunters)
The following is a list of nude ecchi anime series to be based on non-nude manga / novel / VN / game-book sources (so far, at least):
Asobi ni Iku Yo!
Dakara Boku wa, H ga Dekinai.
Gokukoku no Brynhildr
Sekai de Ichiban Tsuyoku Naritai!
Dansai Bunri no Crime Edge
The following is a list of non-nude ecchi anime series to be based on nude manga / novel / VN / game-book sources:
Mai-Hime (Mai-Hime manga had nudity, the anime did not. Spinoff anime Mai-Otome Zwei OVAs had brief nudity)