I don’t believe that being single/ celibate and being asexual are synonymous, I think the significant part of asexuality is the lack of sexual attraction to others. Obviously you can be single/ celibate, whether through choice or circumstance, and still feel sexually attracted to others.
I think everyone would agree that babies/ young children don’t feel sexual desire, they don’t feel sexual attraction towards other people of either sex and obviously any physical contact of that nature would not feel good. Children might feel drawn towards specific people or even have little ‘crushes’ but it’s not sexual. At some point around or after puberty most people start to develop a new type of sexual attraction towards some other people (sometimes solely towards one sex, sometimes of both), at some point physical contact with genitals etc starts to feel particularly good, at some point there is a desire to engage in this physical contact with another person who they feel attracted to. This never happened with me. I do not feel any noticeably differently towards other people now than I did in infancy, I don’t experience any different/ pleasurable feelings when touching my body (or having someone else do it) than I did in infancy. I have never had an orgasm. That part of me has not developed. I don’t feel any different, sexually, than I have at any other point in my life from infancy to now. I don’t think that is the case for most people who identify as straight/ gay/ bisexual etc, that they feel no different towards people they are attracted to than they did in infancy.
The term asexual seems adequate to describe the above for me, if others don’t like the label or prefer a different term such as non-sexual or even dysfunctional that is fine, I don’t particularly desire a flag or a tribe or a label. I can’t really understand those saying that asexuality doesn’t exist, because I am living it and honestly, why would I lie about it? I would like nothing more than to feel sexual attraction and like/ enjoy sexual contact, but I don’t. Having the term asexual has been helpful for me at least in so much as understanding and knowing I am not the only person who feels this way. I think whenever people are experiencing something that seems different from the norm it is helpful to know that even if within a minority they are not completely alone.