There's a reason that you're in my head   And there's a good reason why you're in my bed   But there's a reason that a you're my girl   And there's a reason that a you rock my world, you rock my world, you rock my worrrrrld      Cus you're dirty   But you got a good heart   D-D-D-Dirty   But you're not a cheap tart   Yeah Yeah Dirty   But you got a good heart   D-D-D-Dirty (Yeah)   But you're not a cheap tart      There's a reason why you're in my head   There's a very good reason why you're in my bed   There's a reason that a you're my girl   There's a reason why you rock my world      Cus you're dirty   But you got a good heart   D-D-D-Dirty   But you're not a cheap tart      There's a reason why you're in my head   There's a good reason why you're in my bed   There's a reason that a you're my girl   There's a reason that a you rock my world, you rock my world, you rock my worrrrrrld      Cus you're dirty   But you got a good heart   D-D-D-Dirty   But you're not a cheap tart   Yeah Yeah dirty   But you got a Big heart   D-D-D-Dirty   But you're not a cheap tart