On giving it another read, I agree. There are many asexuals out there who could identify as autosexuals. Myself, I scratch my own itch now and then, but its only really to relieve the build up of excess pressure that causes my bladder to be fidgetier than average. I'm not sure I'd really describe that as 'autosexual': I'm not even really doing for my own enjoyment.
Nope.
As for hormones, I do agree they play a huge role in most sex drives, but, frankly, I have next to nothing for such despite having all the right hormones, so, clearly, something else plays a critical role, too.