PumpkinGin I would like to respond in a longer way but I need to get ready to go out.
In short, my view is - speaking of adults (including young adults) with my DD in mind because that is my main experience - that asexual people have probably gone through a long period of confusion and are well able to know in their own minds whether the definition of asexuality applies to them. Equally, people who experience ISD are probably also able to recognise themselves in the ISD definition. They should have access to resources and support, including medical if needed. But the key point is that it is a matter for the individuals concerned, who are adults, not anyone else, to say, unless they have specifically sought advice around it.
Also important I think is that there is a clear lack of research into asexuality. So if we think that sexology and sexual science began in the late 19th century with a focus on hetero and homosexuality, and one of the largest ever surveys on sexuality in the mid-20th century (Kinsey’s) put people who would fit the definition of asexual into a column marked X and did not investigate further, and that gay rights and acceptance of gay equality is more recent still (into the 20th century), then it is not difficult to see why there is so much misunderstanding and prejudice about asexuality. It is genuinely not part of the cultural discourse (and so when GG mention it, it is not only out of place because an organisation for children, but because it does not have a place in our culture, hope that makes sense). It is not even as if it has an uncontested place in Pride, many people would argue asexuality is not an orientation, it is an absence, and asexual people have not been persecuted, so don’t belong their either.
I need to go, but just a footnote that I also think Kinsey is problematic for a whole host of reasons, but that is a separate debate.