Tell us you don't have kids without telling us you don't have kids. Short of totally unplugging your children from broader society via homeschooling, joining a commune, or similar extremes, children are exposed to whatever other children's parents permit through nothing more complicated than their interactions with other kids. An example from pre-digital times would be that one kid who's dad kept a stash of nudie mags unsecured which invariably lead to hushed giggling in the back of the bus.