I've named changed as I am really freaked out (as my name change suggests).
DS just 7 has ASD. He has always been very tactile and loves touching skin and having big hugs. He is always kissing and hugging me. He is also very tactile with other adults in the family, granddad, aunts etc.
We were watching his older brother play football earlier today and ds and a girl of similar age who we know were playing close by. They were given instructions on how far they could go. Basically field surrounded by trees, then a perimeter fence, so they can't escape. At one point they went behind some trees so I went to bring them back, when I go there I thought I saw ds pulling the zip up on his onsie (outdoor one)! I asked him what he was doing... nothing was the reply.
I've just talked to him again at bedtime and he has told me that the girl was laying on top of him and he wanted her belly to touch his. He also said they were kissing.
We have been through the NSPCC pants rule on a number of occasions previously because we were going through a showing bum and willy phase (which I thought we put to bed)...
He does not watch adult TV or have access to potentially inappropriate stuff on his ipad. He is never in a situation outside of the home without me (apart from school).
I really don't know what I should do now and could really do with some advice please.