No, I just think it's about being realistic rather than idealistic.
At age 13 I, and those in my class, all knew about sex, including things like anal. Kids today are exposed to a damn sight more because it isn't about how you protect your child, it's about how every other parent protects theirs too, and you can't control that.
The dice thing should result in discussion about what is healthy and what isn't, with an emphasis on consent.
I don't see the point in denying to children that sex is enjoyable. I don't see the point in limiting education and conversation to the bare bones, because frankly it doesn't work. The rate of teenage pregnancy, abuse and STDs are a flying testament to that.
Ideally of course, this would all be home taught. But it isn't an ideal world, and parents are often way out of touch with what their children are already exposed to, or lack the rounded experience and knowledge to be able to lead those sorts of conversation.
Do I think any of this is the place of a supermarket? Of course not. But I do think it belongs in schools, in healthy, controlled environments. I'm not saying promote position of the week or anything, just be honest. People do have anal sex - and why do they do that? Well, it's a form of sex engaged in by gay men, and straight couples. And actually, a lot of people do it because they feel pressured to, which isn't OK.