Mark The problems associated with issue are widespread there are varying opinions I.e is he developing a fetish? or is it because he wants to wear them because he has accidents beyond his control!? or is he just lazy and leaves it till its too late!?. Does he have a medical problem has he been checked out by your physician?partially i agree with the other Tom YOU or your wife who ever is the closest to him Need to discuss this with your sonCalmly collectively and constructively (I know it is easier said than done....Lol and only you as a parent can then decide which of the categories he may come under we are not your sons parents we dont live with him so we can only give an impartial opinion of what facts you give us !plus our own experience with our own children what they went through! hope this is of help to you good luck Tom.Uk