I am more not in the mood than in the mood. I am single and don’t have a SO, so I don’t even think about that. I have other things to worry about and that is not my main focus in life. Also, sexual desire is affected by levels of energy, mood changes, hormonal changes, etc.
I dont think you have to worry too much about that. You don’t have to be in the mood all the time, just like you are not in the mood for certain activities all the time. Sometimes you lose your apetite or don’t feel like working out or going for walks.