i just watched a couple of ebichu episodes. to those who dont know what it's about, see here:
http://anidb.ath.cx/perl-bin/animedb.pl?show=animelist&adb.search=ebichu
it certainly is perverted, and depicts ppl having sex, plus some nudity. its rated for adults, but is it hentai? anyway, i enjoyed it very much. that's gainax for you