I have been in your wife's position, OP. My XH would help out with housework etc, but I always had to ask (which made me feel like a miserable nagging wife) and I never really felt appreciated for what I did, or like he even really noticed me.
I hated sex with him because I felt it was just sex he wanted, not me specifically. I could have been anybody... it was just another of his needs I was responsible for taking care of!
In a 12-year marriage, the only time I remember us actually having good sex was when DD2 was a toddler and my parents paid for us to spend a weekend in a big hotel, with theatre tickets and a posh meal out, while they babysat both kids. Just spending time together, doing something we both enjoyed, with no other responsibilities actually created a spark!
I also remember begging him to take the kids to his parents' for the weekend, just so I could have some me-time. He did it ONCE. In 12 years! If he could have done that once a month or even every couple of months, our marriage would probably have survived much longer, but as it was, I ended up so burnt out I couldn't handle any more. I actually told him once that I was filing for divorce so I could have two weekends a month for myself, when he would HAVE to take the kids overnight and give me a break!
I'm now remarried to a lovely man. The attraction wasn't at all physical, at first, but I loved his company. We could spend hours talking about anything and everything and we're on the same wavelength. Last night he arrived home pretty late from work, the whole place was a huge mess and the first thing he did was to ask "what's the most important thing that needs to be done?" then picked up and hoovered the whole appartment! Most days he just steps in and does whatever needs doing, without any input from me at all.
And he regularly arranges babysitters and nights out, or romantic weekends away when my kids are at their dad's. He happily took care of the house and kids for a week when I went to stay with my best friend who was pregnant and on bed rest!
We have a great sex life, because I feel so loved and respected that by the time we fall into bed at night, I just want to snuggle and kiss him and show him how much I love and appreciate him, which inevitably leads to us both expressing those feelings physically. It's not just sex. It really is making love.
So, I would say the best thing you can do is:
- Take some of the strain by pitching in spontaneously around the house
- Give her plenty of "me-time" by taking the kids away overnight, booking her into a spa break or encouraging her to see her friends etc.
- Try to arrange more "couple time" - a regular date night, short breaks without the kids, but where YOU do the legwork (booking it, arranging childcare etc) so it doesn't become yet another chore for her to deal with.
Good luck, OP. You sound like you're trying to do the right thing, but honestly, being a mother of young children is exhausting. Maybe you also need to ask her (when you're both relaxed and away from the kids) if there's anything she would really appreciate you doing differently. And then do it!