I'm a big promoter in using OpenSim for Education but as a closed grid model so the places kids sign up for can be guaranteed a PG environment. I think awareness is good but panic is unnecessary in terms of announcements like this. It's like anything on the internet - you need to monitor what your kids/students do online and guide them in appropriate choices. The same goes for television, movies and video games.
I also think that having a designated themed grid like this means people over 18 who want to experience sexuality in virtual worlds will do so in a place where other people are seeking the same. It sounds like the setup is being handled very tastefully and respectfully.
In a way news about a grid like this could open up constructive dialogue between parents/teachers and kids about internet safety and following the rules of age restrictions. Some places are for adults and it's smart to make kids aware of that so they can set safe boundaries for themselves.
I do have some concerns that people underage could dodge the age restriction system as it seems like there is always a way to lie on those things. Again that just further states the need for parental supervision of a child (especially a teen's) internet habits. Computers in common space as opposed to bedrooms can be a very effective way to manage this without making a kid feel like you're obviously intruding. And teachers - be roaming in your labs so they know you'll be seeing their screen time. Sometimes people figure out how to navigate through the school filters. Also, take an interest in the games and sites your child/students gravitates to so you can understand them (whether you actually like them or not).