haven't had sex, Ritsuka is 12 though. Soubi was raped by his teacher at 12 though, along with getting whipped and probably other stuff too.
as much as I love loveless, it is shota and shouldn't be on here.....but this is like all the porn there is of it anyway aside from the doujinshi. Don't know why there isn't more, there's fucking shota of everything.
I think loveless follows the fruits basket, and clamp rules as so it lacks good shota/yaoi