If I understand this correctly, Terry, you are asking about obsessive attachments to inappropriate things. I have no experience with Aspies so I don't know how common it is or isn't. Have you tried researching on line or in books about this? The one thing that sticks out to me is that whether or not it's related to being Aspie, in my humble opinion, it needs to be addressed. It seems that several difficult child's have gone thru a phase of this- at least mine did- when puberty hit. But I'm concerned about the extremes and length of time this has gone on with your son. All of our difficult child's have their set of issues so I'm not suggesting that your son's are "worse" or anything, just that it seems like it would be better to get a therapist to deal with this now than to try to deal with it a few years down the road if it has worsened. (Yes- that is easier said than done.) I doubt behavior mod alone is going to do it, but maybe that is the only thing that works with aspies, I don't know.