
I disagree. I think ecchi is as English as sake, sushi, kimono and anime. That is to say, quite English indeed.
Incidentally, I don't think that there is any romaji system where 'ecchi' is a valid transliteration of エッチ.

a while -> for a while?

Ok. 'ecchi' is defined here at least: http://dictionary.reference.com/browse/ecchi
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