I love that my girlfriend sells pictures of her body online
What makes you love that?
She can earn easy money by it
While you may enjoy the easy money, every time that you tell her how much you enjoy this cash it pressures her into doing it more. Have you considered speaking to her about if this is what she enjoys doing?
She's a slut and she deserves to be treated like one.
Most people would be shocked by you calling your girlfriend a slut and that's not a nice way to speak about someone who you love. If she enjoys taking the pictures, then that is fine, but society would consider you a bad person if you're pushing her into doing it.