How to improve sex life

I am at a loss. Our sex life seems to have ground to a halt. He blames stress and the fact that I can’t enjoy it fully in the mornings when he would be interested. I want some love after the kids are asleep as I can relax knowing less chance of doors bursting open (4,2,1 year old).

Quickies became his go to. I rapidly began to resent them as I don’t ever finish with them. This month it was one quickie and that’s it. Nothing else. I feel rejected and I know I have moaned - which he says turns him off, but I feel so sad that a part of our relationship that I valued is disappearing fast!

Ideas to spice it up? Should I suggest porn? Erotic movies?

Help please

A frustrated wife