Language and Lyrics

I find it interesting how some parents don't like their kids hearing cuss words out right. But, they'll let them listen to songs that use that kind of language, or talk about having sex and stuff of the sort. And, I've noticed that it depends on the style of music the "dirty" lyrics are in. If you put the lyrics in a Metal song it's just totally unacceptable, in a Country or Rap song it is mildly unacceptable (depending on the popularity of the song), put them in a Pop/R&B song and it usually goes by unnoticed. I've seen Rock bands, mainly Heavy Metal, and a few Rap bands in the news for their "suggestive" lyrics. But, I have not saw groups like the Backstreet Boys, Britney, Maroon 5, or hell take your pick really. Just about every artist has a dirty song or two, some are not so obvious, some are very blatant. But, the thing that really gets me, is when you hear momma in the parking lot of Wal-Mart yelling at her kid because he said "Shit!" when he dropped his bubble gum, and then when she drives off you hear a song like "Get Low" from Lil' Jon, or Snoop Dogg singing about smokin a blunt, Fergie talkin about her lovely lady humps, Nine Inch Nails talking about fucking like an animal, or AC/DC talking about "Big Balls". And, even worse are the songs that don't say it directly and the parent's don't see what's wrong with the lyrics. Just makes me laugh.