I know the right thing to do is end the marriage and then start up a new relationship, but for various reasons I want to keep the marriage going until the DC are a bit older. We don't like each other all that much, and wouldn't choose to spend time together except as a whole family but we rub along ok and agree on household and parenting stuff. I think of us as co-workers, we do our own jobs, we co-operate on joint stuff for the good of the whole family, we are polite but we have separate social lives and respect each other's privacy.
I like sex, I have always liked it and wanted it fairly frequently. Sex had reduced in frequency over the years, H has always had a lower sex-drive than me and I was usually the instigator. We last had sex nearly two years ago, H has not mentioned anything at all about sex since, if anything he seems quite a bit happier and more relaxed since we stopped. I don't want to have sex with him (not at all, I don't even want to touch him if I can help it), I'm pretty sure he doesn't want to have it with me, but I really, really miss having sex.
I'm fine week to week and month to month, but thinking ahead to perhaps a decade without any sex at all makes me really sad, sadder than a decade without chocolate would (and I'm addicted to chocolate).
Even if we split up now I don't want another relationship with someone else so would be looking for no-strings-attached sex, but all the possible options just seem really sleazy. I don't want an affair because I don't want to have an emotionally demanding relationship, especially if I am still married. I had a look at a website for casual sex but it gave me the shudders to think about having sex with someone whose wife probably has no idea what they're up to. I had a look at some escort ads, which does have the advantage of being a relatively honest transaction without any danger of the other person wanting to develop a relationship or wanting to do something that I don't like, but I have all sorts of ethical problems with paying for sex. Having said that I think it's unlikely that male escorts have been forced into the profession, and while it would creep me out to meet with a young man there are a few out there in their 30's and 40's who, I guess, have gone into it with their eyes open.
I'm not expecting any solutions from you, I don't actually think there is a solution except to wait it out until I can't stand it anymore and then leave H. I have found it helpful to just write it down, and maybe to hear about other people's happy endings.