Some great points made in your response. But what about changing positions? It's not the same as switching tabs, like you say, it helps me get over the routine issue. I used to be very reserved about this. A little too self conscious to go for some of the less standard positions, but I got over this some years ago and just go for it. Without getting too technical, many positions offer much more visual stimulation than missionary, which basically has none. Statistically, (even non porn addicted) men respond strongly to visual stimulation. You don't have to give up this thrill along with porn. As long as you are attentive, and make sure she gets hers, you should be entitled to some fun as well. I think any way you can find to make sex more exciting (assuming your partner is willing) is fair game.