Wow, Nikki,
You and your husband must really love each other! I agree with other people who posted, mind over matter. What helps too is not to focus on cumming. If you focus on how long you last, you worry and end up coming fast. Keeping in shape is great too. When my girlfriend and I first met, we were both virgins. We were so in love with each other that we sexed for 10 hours straight, not including foreplay. I was in great shape back then

, but not now

. If I wasn't so passionate for her, I could not have done that.
I realized after doing kegels and masturbating a lot that holding off an orgasm is not what's important. I learned to recover quickly after I cum without losing my erection or drive. When me and my girl have sex, I usualy cum 6-7 times before my dick can't even move and goes into "repair mode" as I call it. I developed it by continuing to thrust while I cum and even after. After a while, my body learned that orgasm was not the end of the sex. So, even if I cum fast (30 secs or so), it doesn't matter, I just keep going. My GF likes that I cum fast though, boosts her ego and gives her something exciting to feel and watch.
So, I think that if you can't be superman like your husband (amazing guy), then we will just have to try and reduce our refractory period. Can anyone else elaborate more for me?