I have mental health problems and it varies depending on the medication I am on at the time and other life factors.
For a while I legitimately thought I was asexual because I had 100% lost any desire for sexual contact of any type. When I stopped the medication I was taking, started something else, and coupled that with different types of sex, my desire returned. I am bipolar, and if a lot of stress is going on in my life it will trigger depressive episodes and I will lose my desire anywhere from a few days to a few weeks. But when I am in mania I can be a lean, mean, fucking machine. Almost to a dangerous extent.
When I am "normal" I am still an above-average sexual person, but my mental health can make that swing up and down for multiple reasons.