I quit drinking about 10 years ago, and I remember feeling somewhat similar to how I feel today without sex. I think it is called anhedonia. With drinking the feeling went away in 3 or 4 months.

For me, sex is a drug to help me feel better just like alcohol had been. It doesn't seem healthy to me.

I think it is also a result of feeling burned-out and looking for an easy escape from reality. In fact, I think that explains most of my clinging to sexual activity that is no longer practical. I just need to find something else to use as an escape when I am burned-out from the drudgery of life.