Are songs with sexual references/innuendo taking over the music industry, and if so, why?

I've noticed hits that have recently taken over the top of the charts have had some form of sex in them. In fact, half of the last ten U.S. Chart toppers have had some form of sexual references or innuendo in them. Here are the examples:

Crank That-Though the dance was fun to perform, it was the big punchline in the chrous of the song that caused controversy. DeAndre Way decided it would be nice to write "Superman that hoe!" as a part of the song. The Superman is a sexual act in which a man ejaculates on his partner, then puts a blanket on his/her back, thus making the partner look like superman.

Low-Though the song wasn't so sexual, it had two sexual lines. "She turned around and gave that big booty a smack" is something that would obviously take somebody's ears. Also, "Like a pornography poster" is something that is obviously a reference to pornography.

Love in this Club-Do I need to say anything further. This song is a song about having sex with someone in a public place. You can't get more sexual than that, along with some more lines that intensify the main point of the song: Making love in a club.

Touch My Body-It's a catchy tune, with a catchy phrase, but Mariah Carey is pretty much saying she's a sex slave to whoever she is doing it with. Once again, a song about sexual relations, but this time, she wants none of this to be on YouTube.

Lollipop-Along with being a bland song, Lollipop also happens to say "So I can make it juicy for you." What do you guys think it's about?! Oh yeah, a "lollipop." Never mind.

I Kissed a Girl-This is where a line has to be drawn. The music industry is undoubtably an industry that markets towards a young crowd. To promote two people of the same sex doing intimate things is appalling. I Kissed a Girl is sung by a girl, and it turns on boys, while peaking the interest of girls. The song is pretty much saying "Hey kids, you can kiss each other if you want?" Now, I'm not against lesbianism/homosexuality, but to promote such things to the youth before they're too old to fully understand it is just dispicable, especially since it's being used for money, and money only. Stupid.

So, is the industry now run by sex, and if so, why is it that way?