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Are you a nudist? Cary seems to imply you just aren't that interested in hiding yourself during normal showering/dressing activities.
I think there may be a distinction when it comes to your son dealing with puberty. Asking him to leave for a minute while you dress/shower is reasonable and shouldn't be an issue.
But I think he may really struggle with coming to terms with sexuality if his mom is naked on the couch watching TV that he suddenly finds erotic (which can be dang near anything when you are 14).
Do whatever you want, but I think you should consider his potential embarrassment over the issue. Getting hard over your mom is kinda rough on a junior high kid.