Sexually explicit songs have been around for ages.
Chuck Berry's Ding A Ling-well, he isn't talking about a bell.
I read a book about that song, and Berry said that he wanted to perform an explicit song to shake the crowd up. By today's standards, its nothing!
Remeber Elvis's hips could not even be shown.
Tons of stuff in the 60's. Light my Fire the Doors. Rolling Stones (early stuff).
70s. All kinds of stuff-- AC/DC to some disco tunes.
80s.
Sometimes When We Touch (ok, that could be late 70s)
Sugar Walls sheena Easton
Darling Nikki Prince
Physcial Olivia Newton John
Whip It Devo
She Bop
Girls Girls Girls
Like A Virgin
Early Rap
Anything by 2 Live Crew
Baby Got Back (Sir Mix a Lots talks about his anaconda!)
90s (I'm not too familiar )
Theres that one Green Day song about ************
Madonnas whole Erotica album
Case in point, Soulja boy is not the first or the last song with sexual content. Kids will be singing it as long as it played. There will be dances to it as well. I remember doing a dance to Depeche Mode's Personal Jesus.. Some say that song was about ************.
The songs will be out there. I'm sure as a parent you sang a Madonna song, or a Rolling Stones song, AC/DC , etc.... It would be hyprocritical for me to tell my kids to turn it off. When I was my daughters age, Physical came out.. everyone loved that song. When I was my sons age, Purple Rain was released. Everyone played that album until it wore off.
It's nothing new.