Would you have sex with an autistic person?

It depends on the type and severity of the autism. Is the person cognitively aware of what is happening, and is the person capable of making informed consensual decisions, that they can coherently articulate to another person? Then and ONLY then would it be acceptable to do so.  

Yes - As long as it's consensual, how is that different from having sex with anyone else? Only stipulation being that it does depend on the severity. E.g. my cousin has severe autism, can't speak in full sentences. I doubt her ability to truly give consent and I hope to god no one ever tries to have sex with her. 

What a stupid question. Since mild Autism is often difficult to detect, how would you know if your partner was Autistic? And even if you did, WHY WOULD THAT MATTER?? People with Autism have same feelings as anyone else. They deserve the same respect.

Yeah !  Why not ?  They are also  Humans.

I'm autistic, my girlfriend isn't and she's had sex with me. 

If I was in a relationship with an autistic person and it was concensual then yeah, of course. 

since i'm long term married, no.  but then i'd not have sex with anyone other than my wife anyway

Sure, if she was pretty enough, and otherwise satisfied my high standards for a female.

In my youth, I would have sex with any person, and some that might not be totally people.   Being more mature, I would be interested in other qualities besides their autism.