Everyone seems to think that this song is about kissing girls, bisexuality, sexual curiosity, all of that. But Katy Perry said herself that the song is actually just about the beauty of a woman, and the power that a woman posesses because of that beauty. The whole girls kissing is kind of just a metaphor. That's not to say that this hasn't happened to Katy Perry, it probably has, but the song isn't about that. Yeah she probaly did kiss a gurl but it doesn't mean shes a bad person and it doesn't make them a criminal. Its natural and you should express yourself and show who you really are.
* Peace, Love. God Bless.