Of course this song will turn into a religious debate. So, I will start of by saying what "Good ol'e red blooded Christian American boy" has never masterbated to the image, video, or thought of two women making out or having s*. I really doubt there are many who can say they haven't.
Secondly, this song will be popular simply because most straight women have had "liquid courage" and in fact kissed a girl. Due to the taboo nature of it most of us were left feeling giddy like we did something bad and high off all the attention it harnessed.
It's not a gay/straight, left/right, or religious issue it's simply a song about showing affection towards another human being. Stop the separation of the human race by putting everyone in different box. We are all people. We love, hate, cry, and laugh the same.
It's a fun song that I happen to like. Most girls night outs will probably include us singing this song and having a blast as girls usually do when they go out together!