Autism- teenage and sexual/gender identity

Ok, there are a few things going on here, so I'll try to identify with points individually.

First of all, the labels that people identify with can change over time, this can be either due to learning a label that better suits them or they themselves may change. Personally, I always knew that I wasn't attracted to boys. Always. And rather bizarrely I learnt that boys could be attracted to boys but not the same for girls and didn't put two and two together, I was and still am rather oblivious at times. I did however learn of the label asexual (no sexual attraction) and felt this suited until I found the label lesbian, and sapphic (attracted to non-men) at which point I went "oh yeah that makes sense" so in my case it was not having the words to describe what I was experiencing that caused my labels to change.

For my aro ace friend (doesn't feel sexual or romantic attraction) she knew the labels, but went through quite a few (bisexual, pansexual, demisexual, ace and demiromantic,) before arriving at the ones that she currently felt suited her. She had the language but took some time to come to a conclusion about what her experience was.

I think a lot of people assume 'coming out' is a one time thing and that you're always certain of your identity but it's not always the case and your son may just be exploring what he's currently experiencing, with the language and the knowledge that he's got, and that may change over time and you and your son need to be assured that that is OK. It is absolutely fine to discover bits of your identity over long periods of time or find that it changes. He's taking on new information and seeing how it fits with himself, everyone goes through this eventually, and in my personal experience, it's so much better to have the knowledge and language and then explore your identity rather than have the identity yelling in your head without the language to describe it, so I'd say what your son is currently doing is perfectly fine and nothing to be worried about. He may be gay, he may later decide that doesn't fit him, either way fighting him on it won't gain anything for either of you. 

For the second bit about ASC being related to this, there are a few schools of thought about this. First of all, non-confirming gender identities are much more common in people with ASC than the general population and this has been identified for a long time. I myself sit under the non-binary umbrella. There are a few schools of thought about why this may be and NAS does have a good page about it. The school of thought I most agree with is that as gender is at least partly a social construct, and autistic people often have an incongruence with social constructs and social norms, they are much more likely to identify outside of their assigned gender at birth or at the very least be more likely to recognise and accept that without trying to force themselves back into the social norms. I believe this may be what you are referring to. 

I've also seen some data about higher proportion of asexuals and aromantic people in autistic people but I have yet to see any data about ASC and homosexuality or same sex attraction, then again,  I haven't really looked. 

So overall, I wouldn't worry about it. Your son is exploring who he is and is using the language available to him to do so. It may change over time, it may not. Either way, he isn't making any life altering decisions by telling his friends he thinks he might be gay, and if his friendship group is anything like mine was, many of them will make statements about many identities over the years as the get through the puzzling time, and the best way to assist that process is as much information on the language that can be used as possible. Otherwise you're just confused with no way to explain it and it sucks.

Hope this helps, feel free to ask any questions if you have them

Ok, there are a few things going on here, so I'll try to identify with points individually.

First of all, the labels that people identify with can change over time, this can be either due to learning a label that better suits them or they themselves may change. Personally, I always knew that I wasn't attracted to boys. Always. And rather bizarrely I learnt that boys could be attracted to boys but not the same for girls and didn't put two and two together, I was and still am rather oblivious at times. I did however learn of the label asexual (no sexual attraction) and felt this suited until I found the label lesbian, and sapphic (attracted to non-men) at which point I went "oh yeah that makes sense" so in my case it was not having the words to describe what I was experiencing that caused my labels to change.

For my aro ace friend (doesn't feel sexual or romantic attraction) she knew the labels, but went through quite a few (bisexual, pansexual, demisexual, ace and demiromantic,) before arriving at the ones that she currently felt suited her. She had the language but took some time to come to a conclusion about what her experience was.

I think a lot of people assume 'coming out' is a one time thing and that you're always certain of your identity but it's not always the case and your son may just be exploring what he's currently experiencing, with the language and the knowledge that he's got, and that may change over time and you and your son need to be assured that that is OK. It is absolutely fine to discover bits of your identity over long periods of time or find that it changes. He's taking on new information and seeing how it fits with himself, everyone goes through this eventually, and in my personal experience, it's so much better to have the knowledge and language and then explore your identity rather than have the identity yelling in your head without the language to describe it, so I'd say what your son is currently doing is perfectly fine and nothing to be worried about. He may be gay, he may later decide that doesn't fit him, either way fighting him on it won't gain anything for either of you. 

For the second bit about ASC being related to this, there are a few schools of thought about this. First of all, non-confirming gender identities are much more common in people with ASC than the general population and this has been identified for a long time. I myself sit under the non-binary umbrella. There are a few schools of thought about why this may be and NAS does have a good page about it. The school of thought I most agree with is that as gender is at least partly a social construct, and autistic people often have an incongruence with social constructs and social norms, they are much more likely to identify outside of their assigned gender at birth or at the very least be more likely to recognise and accept that without trying to force themselves back into the social norms. I believe this may be what you are referring to. 

I've also seen some data about higher proportion of asexuals and aromantic people in autistic people but I have yet to see any data about ASC and homosexuality or same sex attraction, then again,  I haven't really looked. 

So overall, I wouldn't worry about it. Your son is exploring who he is and is using the language available to him to do so. It may change over time, it may not. Either way, he isn't making any life altering decisions by telling his friends he thinks he might be gay, and if his friendship group is anything like mine was, many of them will make statements about many identities over the years as the get through the puzzling time, and the best way to assist that process is as much information on the language that can be used as possible. Otherwise you're just confused with no way to explain it and it sucks.

Hope this helps, feel free to ask any questions if you have them

Thanks for this, I really appreciate you sharing this. And it all makes good sense. 

The only challenge for me is how public he is about it all, he also tells total strangers he has a disability or autism and I worry about his vulnerability. 

I'll support him whatever his journey and wherever he goes, just want him to do it safely..