It is nice - I think. Not sure I can remember that far back 
It's also not for children to be thrown into the middle of.
Teach them about it, explain about relationships, yes. Don't make them ashamed, of course. Discuss it all at age and understanding appropriate levels. That's all vital.
But it's just not right to sexualise them. And it's important, I think, to let people know that's what it is.
I don't think that parents dress their girls like hookers thinking that they are sexualising them, but that's what they're doing. So a campaign to get people thinking is good, surely? To make people pause before buying that tshirt with the nipple tassles, or the knickers with "dive in" on them?
I mean I have to wonder why you wouldn't think all by yourself. But clearly that's the case. So a little -erm, have you thought of it this way - is no bad thing, imo.