Okay, it seems that everyone else that has replied to you has been chicks, so here it goes from a male point of view.........

He wants reaction! Not saying you aren't doing something right, but he wants to hear something nasty come out of your mouth. Be careful not to say something that may upset him (ie. oh yeah, give it to me deeper........he's thinking........that's as deep as it gets). But give him something to work with.....just fuck me slow, or pound me with that dick.....something along those lines.