I know kissing a girl was a new and interesting experience for Katy Perry, and so it makes sense that she would respond positively to aspects of it that she will, in time, come to criticize. For instance, if I guessed a girl whose lips tasted like cherry Chapstick, I would suggest she try using a brand of lip balm that doesn't feel like rubbing glass shards on your mouth.
Oh shit, maybe I should just call and tell her that! Nah, I'd be really polite on the phone, all "Hey, all the other messages people have left you make me laugh. A lot. Also, your song is tits."