Restrict content (18) on Netflix

We've got a few Apple TV's in the house now and subscribe to Netflix. Some are in the kids rooms.

Is there anyway to restrict content on Netflix to not allow 18 for eg on one and not 18 and 15 rating on another? I know there is a parental setting on the Apple TV but in think that's Just for iTunes content.

All the netflix are on 1 subscription obviously. I can't find anything. Surely this must be a common problem.

Cheers

Well the profiles are now live but there's still no restrictions as such, and its easy to change profiles, no protection.

It's a step there, the kids now log onto their profile, but needs a bit more