Lyric discussion by Sinitivity 

Cover art for Sandpaper Kisses lyrics by Martina Topley-Bird

I'm thinking sandpaper kisses equates to men kissing men, thus

"Sandpaper kisses, papercut bliss Don't know what this is, but it all leads to this: You're gonna leave Her You have deceived Her Just a girl"

ultimately means - you're going to leave her because you're gay -

"I want the soul of something simple to take home with me The world as someplace simple it's my home you see"

Soul of something simple - A desire for something not so complicated.