(I've obvs name changed for this)
Been with DH over 18 years. Usual story of sex being good in the early years but dwindled - even before we got married.... to about once a month or less. Even on our month long honeymoon (10 years ago) we only managed it twice...
I just thought this was how life was, then had kids and it got worse.... I was terrified of sex after the birth of DC1 and forced myself to keep doing it to conceive DC2. I'm over that trauma now and DC2 is nearly 7 but I don't want sex with DH. He's nice and kind but he's like a brother or family member and it's getting worse. I used to be ok with sex once we got started, then noticed I didn't like him kissing my mouth so avoided that. The last time we tried it I also ended up blurting out 'stop doing that with your hands all over me!' the whole thing just makes my skin crawl. 
The thing is, I still have a sex drive. I feel sexy and attractive and masturbate but I don't feel it with him. At all. If I don't masturbate I don't desire him any more either, tried that. I just lose the 'sex' bit of myself.
Is there a way to reverse this physical revulsion? I have to say our relationship overall isn't great but this is definitely the dead part.
The truth is if we didn't have kids I'd leave tomorrow. If he left me I'd be relieved, but he's too nice for that 