Two months ago my 16 year old son told my wife and I that he preferred boys and that he was having a long distance relationship.

Way more troublesome to me is that I found some adult diapers in his room and that he wears women's underwear. He is unwilling to discuss the practice and I respect his privacy.
I need to understand what he may be doing with these adult diapers. When asked he tells me that the diapers don't fix any problem that he may have but allow him to do stuff he enjoys.

Over the last 9 months he has become much more withdrawn, gone is the outgoing happy preteen. School work has suffered.

Any experience anything like this. Any and all advice is welcome