that's so hard!! i have the same gut-wrenching feeling...but then i remember that we were singing along to things like "Cat Scratch Fever" when i was a kid...
99% of the music back then i didn't "get" until i was much older - like in college, because i had heard it all my life, so i never even stopped to think about it once it became obvious. I heard "take it on the run" by REO Speedwagon the other day for the first time in years (decades?) and really listened to the lyrics and was so sad. i never realized that song was about cheating! :( lol! yes, i'm a BIT more oblivious than most lol.
BUT my point is kids put their own spin on things. i used to think a lot of songs talking about sex were just talking about two people "in love" and i never took it any farther than that.
i prefer my son be exposed to good music, even after it all. i love music. i wouldn't want to remove it - and really, once you start censoring, it's really hard to know where to draw the line. every kind of music has inappropriate themes. you'd cut out a LOT - a LOOOOT - if you tried to start really buckling down on it.
and oh yeah - it CRACKS ME UP when my kindergartener does the "wigglewigglewigglewigglewiggle" - complete with butt wiggle. however, i was pretty mortified when we walked through his gradeschool and he started singing "i'm sexy and i know it" - so it was a good opportunity to talk about what's appropriate and what's not. it's a teaching moment ;)