"The Asexuality Spectrum:
Like any other sexuality, asexuality consists of a spectrum of attraction and preferences as well. This is my personal take on it, others may have slightly different interpretations, but this is the gist of it.
At the farthest, most "asexual" part of the spectrum, we find people who never, ever experience sexual or even physical attraction to another person. Sometimes they will have a general dislike of touching in general, let it be holding hands of hugging. Truthfully, there are sexual people who dislike physical contact in general as well, so in my opinion, general physical attraction doesn't seem like the best way to define the spectrum, but that is my personal understanding of it.
Further away from this extreme end of the spectrum are asexuals who are gradually more comfortable with physical touching and expressions of affection: cuddling, hugging, holding hands, even kissing, but are still asexual and do not feel an urge to have sex with anyone, ever, really. They might think about it, but dismiss the idea quickly in their mind should something more appealing come up, such as eating cake or competing in a triathlon.
As we move further down the spectrum towards the sexual end, we come across our "grey asexual" section. These are people who do experience sexual attraction: fleetingly, rarely, or sometimes just for one specific person at a time. Some people who identify as grey a may experience sexual attraction more frequently than would be considered asexual, but do not feel that sex is an important part or driving force of their life and so choose to identify as asexual.
Demisexuality, bridging the hazy divide between asexual and sexual, is when a person can become sexually attracted to someone only after developing a strong emotional bond with them, romantically or not. Demis are rarely attracted to anyone sexually that they do not know and love.
As with any sexuality, a person's asexual identity or position on the spectrum (if any) is self determined by that person and how they themselves feel they fit in."