Hi there ~
There is what we called anhedonia
or a lack of interest in activities, and if it is about sex you probably have sexual anhedonia. I would think of it as being a result of depression
. There are many antidepressants that can cure your condition. If you do not have a history of seizures (fits) then you might benefit from what is called an NDRI or a norepinephrine
dopamine reuptake inhibitor. I hope you find a qualified psychiatrist
that can treat you for this condition.
Take care and have a lovely day !