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This is a rough lewdness scale I've sketched out for you, from 1-10 with 1 being the low end of lewdness and 10 being max (I rated MonMusu at a tentative 6):
1 - Gochuumon wa Usagi Desu Ka, Yuyushiki
>shows that have only a little fanservice, but enough sprinkled in that it's noticeable
2 - Momo Kyun Sword, Tawawa on Mondays
>the show is an excuse for light fanservice
3 - Seitokai Yakuindomo, KLK
>shows where lewdness is inherent to their content, but it's not quite tawdry enough to be pure fanservice
4 - Cross Ange, Code Geass
>frequent nudity and lewdness, maybe the occasional titty
5 - Yuusibu, Zero no Tsukaima
>I'd say this is the bare minimum lewdness level to be considered a real ecchi anime
6 - MonMusu, Okusama ga Seitokaichou
>uncensored titties start appearing with more regularity at this point, scenes often become explicitly sexual rather than just suggestive
7 - High School DxD, Shinmai Maou no Testament
>essentially a more intense version of the previous level
8 - Seikon no Qwaser, Valkyrie Drive
>even more intense, plus frequently include more obscure fetishes
9 - Kiss x Sis (TV)
>how did they get away with this?
10 - Kiss x Sis (OVA)
>hotter than most porn
Gave you a bunch of examples at varying levels of lewdness, take your pick. I got more options too. Other anons, feel free to chime in where you think I'm totally offbase, more opinions gives him a better idea of things.