@peridito - I'm sure there are, but I'm not sure they help..
Longish post - apologies...
It does seem to be a common issue, and I've often thought (tongue in cheek mode!!!) that, as there is a mix of genders that seem to have the the same problems, we MN'ers could have a support group that meets regularly, to discuss the issue, and help each other out, iyswim.. 
We are living in very strange times though, so bear that in mind. If your partner is normally out at work, but they are now around you 24*7, then it definitely puts a strain on a relationship, and it's not a surprise that your partner may look on you more as a work colleague than as a sexual partner.
I don't think you can allow your partner to shut a conversation about your sex life down though. My question would be why are they shutting it down? Are they embarrassed about discussing it? are they worried that someone else (kids maybe) will barge in? or, more worryingly, do they have something to hide?
My XW & I had long discussions about her libido. Originally, I took the initiative by booking us a weekend in a hotel (admittedly, our kids were old enough to fend for themselves), so that we wouldn't be disturbed, and we sat in the room and talked.
It was painful for us both, and there were tears on both sides, but we had an open and honest discussion about our (lack of) sex life, with no blame attached to either party. I started by asking what was going on with our sex life, as we didn't seem to have any.
I was ready to hear difficult things, and also ready to take some blame, as were two of us involved.
It didn't do much (actually anything) to change things, but it meant that the genie was out of the bottle, and that subsequent discussions were easier.
Whilst it didn't save our relationship, it was a very worthwhile exercise - we are still very good friends, and have actually somehow grown closer since the divorce, and particularly during lockdown.
My opinion is that you must (for your own sanity) push the discussion, regardless of the outcome.