Yesterday easy child 1 came to me with one of her dolls. The skirt was pulled down and she wanted my help getting it back up. She told me difficult child 1 pulled it down. I had sent difficult child 1 to his room for a few min. I went looking for the other kids because I thought it weird that difficult child 1 would do that. difficult child 3 had another skirtless doll. He held it up to me touched the crouch and said "I like the underpants off." difficult child 3 said difficult child 1 had taken this dolls skirt off too. I wanted to know where the skirt was so I could put it back on. No one could tell me. I threw the doll away. Then difficult child 1 told me where the skirt was. I got the doll out of the trash, washed it off (it was a small plastic doll), put the skirt on, gave it back to difficult child 3, and told him to leave the skirt on. Then I yelled at difficult child 1. I yelled I would take his head off if he ever did it again and to not touch the dolls anymore. Then sent him to his room. I don't think difficult child 3 would've come up with that about underpants by himself. He just doesn't think about underpants. His own or anyone elses. Its a constant fight to keep everyone covered in this house. They just don't think that its not appropriate to go about the house without clothes on. difficult child 2, difficult child 3 and the pcs are clueless about clothes and bodyparts. This part scares me. easy child 2 has started taking off all her clothes every chance she gets. I've even started duck taping her diaper shut. She wants to potty train though. This morning (when I'd had a chance to calm down and think) I tried talking to difficult child 1 about it. He wouldn't talk about it. I tried to instill that some parts of the body are special because they are used in sex. That sex is special but should only be used in certain circumstances. That it is very wrong and hurtful if it isn't. Then I asked him the big question. "Do you know what sex is?" He would not answer but looked at me like he hated me. I pressured him to answer. I asked again. I told him just say yes or no. Still nothing but a glare. I believe he does know what it is. I believe x has exposed difficult child 1 to it somehow and yesterday that exposure came back to haunt us. I really don't know how to handle this. All I can do is talk to the therapist and hope difficult child 1 will also talk to the therapist. difficult child 1 sure isn't going to talk to me about it. I don't think talking to the therapist is going to be enough to ensure this doesn't happen again or doesn't happen to a sibling instead of a doll. difficult child 1 was supposed to have been a shadow during this time. He was supposed to to be in my sight at all times; sticking to me like a shadow would. How did I let this happen with the dolls? I thought he was with me. I must have slipped up and let him out of sight. I can not slip again.