Do you help with the kids? I firmly believe that the stay-at-home doesn't always have it as easy as people think. Being cooped up is tough. I'm sure you assist when you get home.
Do you guys ever go out? Did you try getting babysitters and having date nights and really making it about the two of you?
I'm sure you've tried a lot of stuff and I'd love to hear about it. You get it every week or two though? Some of us here remember that much sex as a fondly distant memory. I think I could do a month standing on my head

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