Koibana Onsen is a reminder that while filler sucks in anime, it can be quite awesome in ecchi. Set at a mountain onsen bath, every chapter brings new characters, which means a constant flow of new girls getting naked, with nudity in every single chapter so far.
Amazingly, that is all the first five volumes have to offer. It doesn’t exactly instill a ton of confidence in Infinite Stratos second season, though I guess any nipple sightings at least show that the novelist creator is not opposed to having them in his adaptations.
Shape shifters and supernatural beings wage war in this fantasy-action manga. Though not what I would consider “ecchi”, it none the less provides ample amounts of well drawn nudity, as Seinen manga is known for doing.
One of the perks of popularity in this business is that you can expect plenty of spinoffs. Since Muv-Luv is an eroge (albeit one with very strong storytelling), most of the spinoffs have included nudity.
Other than the sure to be godlike Maken-ki Two, no other 2014 ecchi series has me more excited than Seikoku no Ryuu Kishi, alternatively known as Dragonar Academy.
Devilman Lady comes from the highly influential long time mangaka Go Nagai, author of many notable old school manga including Mazinger Z, Cutie Honey, and Devilman. Go Nagai was a bit of a pioneer in ecchi and hentai-hybrid manga, his works almost always contain nudity and/or R-rated adult themes.