My 16 year old son is going through a phase and dont know what to do can you help me?

He started as of last night walking around the house naked. My husband is on vacation so I cant ask him to talk with our son. I have 3 other kids all daughters, one is 20, the other is 18, and the 3rd one is 14.What should I do I cant even talk to him because its wrong for me to see him naked.If I don't act soon my 14 year old daughter will start doing it also because she idolizes him and copies everything he does.