Gramatically Correct

Looks like Amy Winehouse's husband, Blake Fielder Civil has been writing naughty letters to a fellow female inmate. Why are these letters so bad? I won't go into great detail but here's an example of what he said: “I squeeze your throat whilst your sucking me and I ask you if you are a dirty bitch.” Come ON now! Who incorrectly uses the second person possessive adjective with a contraction followed by the present participle? Duh.

When I receive dirty letters from my jailbird lover, I expect better grammar. Right, T-Bone?