It's a story as old as time itself except nowadays women have even more on their plates in terms of being expected to be fully functioning worker bees for decades as well as retaining libidos like 20 year olds into their 60s and beyond.
Your hormones will be all over the place right now and all your baby making ones will be leaving the building because you don't need them anymore. His however are constantly ready for action and will be for ages. It's biology.
Most of the time (I know, not always) women over the age of 40 are mismatched sexually with men. That's biology and we're fighting against nature when we're expected to have the same sex drives we had in our 20s.
Chuck feeling older, less attractive and a hearty dose of the sexy - "but but we haven't shagged for x many days" into the mix and it isn't surprising that sex doesn't happen as much as the man wants it.
If you can find time to help your own health and fitness, that's would absolutely be for your benefit. Your libido might be helped as well as you'll feel better about yourself.
Suggest he does some reading up on perimenopause and see if you can factor in some intimacy that DOESN'T lead to sex. So many women start to back away from any intimacy for fear of it's always having to lead to sex. So less cuddles on the sofa even happen. It's a vicious circle. He needs to realise that any pressure will just make it worse. He needs to show you lots of affection without it being about him getting off. Selfless affection. That will make you feel like you're worth something other than just being his vessel.
He's got a right to want to have sex but he has absolutely no right to have sex with another person. Ever. No one does. It sounds so basic but ultimately men have to penetrate the woman to have sex. Her body is entered into. Never his which men never seem to be able comprehend. If she's not turned on, being penetrated is not enjoyable. They need to think a bit more about that when they're just using guilt trips to get laid.
That or you split like the millions of other couples that can't seem to work through this most natural of periods as the 'in sickness and in health' old stick seems to go out of the window when he's not getting a hole to fill as much as he'd like.
Communication is everything. Good luck💐