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namekianer said:
Aki Sora OVA, 1 (2009) Hentai
Aki Sora: Yume no Naka OVA, 2 (2010) Hentai

Booth are Hentai, not Ecchi. And they are in the Lists under Hentai...

And you got that from where? MAL considers it “R+”, which is not hentai (that’s “Rx”). http://myanimelist.net/anime/6987/Aki-Sora

A-P has it in its database, and A-P doesn’t add anything that is considered hentai. It’s tagged both as “ecchi” and as “explicit sex”. http://www.anime-planet.com/anime/aki-sora

AniDB considers it “ecchi” and “seinen” and not “18 restricted”. http://anidb.net/perl-bin/animedb.pl?show=anime&aid=6782
A hentai with the “18 restricted” tag: http://anidb.net/perl-bin/animedb.pl?show=anime&aid=3527

Nobody considers it a hentai, because it’s not. Its manga isn’t sold as hentai, it’s sold as ecchi. By the way, there are TONS of manga that are really explicit, and are still not considered hentai. Another anime that isn’t considered hentai even though it has sex is Futari Ecchi:
http://www.anime-planet.com/anime/futari-ecchi
http://myanimelist.net/anime/382/Futari_Ecchi
Post #747853 & Post #4321864.