Horrible with my wife?

well me and my wife have been married for 4 years now, im 24 and she is 27 and we have the most wonderfull life together and i love hear dearly. but when it comes to , its veryhard im no means disgracing my wife but she is 5'0 and weighs 290lbs, and weve done it so much that I just wish she was a little more slender because it is all dropping all over me, and i love her so much im 510 at 180 and it is hard because one day on mtv a bikkini show came on and just that enligtend our pleasers (my) pleasures but that doesn happen much and i mentioned watching a adult film as we did it and she gets up set of the idea and it has nothing to do with her, just I enjoy that type of female but wolud never NEVER EVER have any kind of affair on her,and its not even tempting so dont even suggest, but any suggestions to gaining a photographic memory or making a adult film something we can watch as were doing it? i feel so bad but i just wish not that she was skinny that it wasnt droppy and covering