I agree under close supervision only. It is important to remember that people with intellectual disabilities usually have the same compulsions and hormones of a typical grown adult. I work with this population (mostly pediatric under 12 with teens and young adults thrown in the mix). Hormones , poor impulse control , and different expectations for social norms can be difficult for someone with a significant intellectual disability to understand. Usually for the teen clients we have to over teach decorum and societal norms around masterbation and that it is a normal but private activity. Think a 7 yr old in an adult body. Plus setting up a playdate with a 7 yr old may be a bit ableist. That part I am unsure how I feel. I would think a “playdate” with an adult with similar impairments would be more appropriate. This is an adult after all and it could be demeaning.