You're not fucking her good enough, put some back into it! Slam into her. Go balls deep with her, change the rythm, hold back when she expects it and then put it deep into her as she's not anticipating it. Properly take her!
Boring but perfect looking girl who's never had to make an effort in her life to be interesting, she'll soon step down a little bit in her standard to find someone trustworthy who will never leave her. And then make babies and live happily ever after.