Men are conditioned (not that they can't unlearn it) to be attracted to things that remind them of youth (gross, yes) such as naivety or innocence. Those are things that autistic girls or girls with low incidence intellectual disabilities are assume to have in bulk. It's either "her mind doesn't do what mine does so she'll be easy to control/use" or "her mind doesn't do what mine does, how cute that she needs me"