Oh well, if the parents does really complain about the music contents on AC. The FCC could step into the programming...? Well, as a music & radio enthusiastic and a gamer myself. Lets take look at how the ESRB took over the PC and console games and rated them with all inappropriate contents in the game listed on the game sold to parents who are buying for their kids.
Later with the effort of Hillary Clinton, most major game retailers restricted the sales of M (Mature 17+) rated games to consumers under the age of 17. Though this is self-regulatory effort after Hillary spoke about it in the late 1990s/early 2000s. Consumers that looks like they're below 25 years old are likely to be required to present a state identification when purchasing an M rated game (like Grand Theft Auto). How did it all started? Well some parents had been reporting and complaining the influence of violence on children from violent video games, so came the birth of the ESRB (Entertainment Software Rating Board) organization.
Lets go back on look at the music contents on AC and grocery stores or thrift stores today that plays straight-off an AC station or an AC playlist. If there are enough parents out there to complain about the music on AC that is not appropriate for their kids. An organization probably called ACPA (Adult Contemporary Parent Advisory) for explicit contents on AC formatted commercial FM stations in major markets and all other markets. As of how game developers eliminates the inappropriate contents through patches and stores restricting sales of M rated games to consumers under 17. With an organization pushing the limits, Adult contemporary programming directors may start filtering inappropriate songs about sex which also make room to bring back a lot of the traditional love songs of the 70s,80s,90s of Michael Bolton, Celine Dion, Phil Collins, Richard Marx, James Taylor, and back to the way ACs sounded in the 1990s. How would AC really work out well with Arbitron/Neilsen PPM? Well, it doesn't even look like parents really care about the inappropriate materials on AC than they would for inappropriate materials on movies and video games. So, as a result regulation or self-regulation on AC contents is very unlikely.