hi there, here's my 2 cents worth of advise. Have you tried blind-folding your partner or yourself? This may help. Try a bit of kinkiness like bondage. Tie him to the bed, blind-fold him. Do what you think he will love you to do, let him enjoy... Then climb on him and let him taste you. You should be able to get the pleasure out of it...
My wife is also having a flubby tummy after her delivery of my beautiful son, but i still love her, its how you make sex exciting, although I admit that visual effects will affect the way you enjoy, but there are other ways to make it exciting...
To us guys, sometimes, imagination helps makes us cum... no need to see, its how the gal make us excited... Cheeros!