The tag "erotica" could solve the problem, but unfortunately, together with it, we would get a second yuri vs shoujo ai dispute. Because the amount of eroticism is a rather abstract question.
Remember when we thought this was canceled and got the god tier "Arigato" animated gif? I love this manga about friendship, and love to geek out over the gorgeous artwork.
@TheWisestofWolfies
The Ecchi tag gets abused on MD quite a lot, for example Otoyomegatari has several chapters where woman have their tits hanging out with nipples visible, doesn't have a ecchi tag (it shouldn't get one either) and then you have Drifters which has nothing ecchi going on at all got an ecchi tag well before it got it's gore tag.