I believe I am what you would call demisexual, except I don't want to be considered in any way asexual because I am actually extremely sexual, I have a very high libido, I fantasise about sex constantly, I always have been this way. It's just that if I don't have an emotional connection to someone, my lust is undirected. It is channelled inwards to fantasies or by association to fandom "ships" where the characters are in love. But even at those times I am extremely sexual. It's just not directed at someone else unless I know them well.

And now that I have a relationship, I am wanting to have sex all the time with him.

I understand that asexuality is supposedly "lack of sexual attraction to others" and not necessarily "low libido" but I think there's problems with the idea that demisexuality is inherently on the asexual spectrum, because if "asexual" can be used to describe me, the most sexual person I know, it's not a very useful word, and it doesn't convey anything about me.