I went to the bookstore, bought a book about puberty/sex - it's been years, so don't remember the title - had him read a chapter a day, and then we would discuss for any questions he had. This worked out very well for us. Factual and scientific works well for spectrum kids usually. As for explaining his autism, I just began with talking about how brains are all different, some are more inclined towards math, art, music, etc... and some brains are good with social skills, some are not quite as good... every brain is different in every person. Some brains are autistic type, then explained a little about autism, and that his brain is on the spectrum of autism. I never said "disability", or "defect" or anything like that, I used the term "brain difference".

I would tend to advise you to take your cues from your son as to what you should tell him , and when . Also , some of us autistic people , including myself , are asexual [autism-help.org] . So we might not feel comfortable talking about a topic which holds no personal relevence , or interest to us . Just saying .

I was very matter-of-fact with my son. I am with all his questions. And I let him come to me when he wanted answers instead of taking him aside and forcing him into the talk. He's not the kind of kid who would have heard about it the wrong way from others. We've been able to discuss reproduction, drugs, rape, and a whole long list of topics this way.

I have an 18 yr old Aspergers...fortunately for me he is very high functioning so explanations were pretty much cut and dry...of course he was exposed to peer talk at school and I always encouraged him to discuss anything he heard said. I had to correct a few times because of typical lousy attitudes that we all know are present. For us my focus was always aimed at teaching respect for women. He understands that no means no and he understands that violence of any nature us not acceptable or allowed and has consequences.
Your childs "talk" has to be customized to his intelligence and academic and emotional level. You tube can be helpful as well as good old fashioned textbooks on the subject.
Hope this helps ... Good luck.

As far as the talk goes it would depend on his level of academic functioning, that is, it may be that the science and the facts are the best way. If there's a learning disability as well I'm not sure but this link to the UK's National Autistic Societies webpage may help. It's the front page so some searching may well need to be done

[autism.org.uk]

Is there any family members that are like a father figure uncles grandparents brothers they can help you.