Reassure him that this is a natural thing but that there is a time and place for it. Explain that when he would like to explore there he needs to be in a place that is his and a personal space not a public or family place.
We have the same issue with our son, sometime he remembers and takes private time in his room, other times he needs reminding.
When my son started with touching and exploring, I didn’t make him feel like it was wrong, cuz it is natural for them any kids really, but I explained that it’s to be done in private, his room or the bathroom, I made him feel comfortable about it and that it’s ok to be curious
Redirect him to private room and perfectly normal and just make sure has shower
This is a really common concern for parents of children with autism, and it's great that you're looking for ways to help your son navigate this. Children with autism often explore their bodies as part of sensory seeking behavior, which is very natural — but it's also important to teach appropriate boundaries.
Here are some Show Full Answer
My son did something similar and just really had to be redirected to his room enough that he learned that is the most appropriate space for that. He still tests boundaries some times but very little.