NONSENSE!!!
I haven't told you what side of the bed I sleep on. I haven't told you the name of my home town. I haven't told you my blood type. Etc. Etc. Etc.
These are all facts that I haven't told you. Am I therefore lying?
You haven't told me these things either, so I guess you're lying too - right?
Now - having said that, I do feel that it is best to share important information with certain people - especially someone in close personal relationships.
But there are times when it is specifically NOT called for. For example, in my case, my (partial) DADT situation means that my wife does NOT want to know or see when or if I dress beyond the agreed-upon boundaries of what she's willing to accept. She knows I do it, but not how, when, or how much. She doesn't WANT to know, and I don't tell her.
Is this lying to her?
Not in my book, it isn't. I'm respecting her feelings and honoring her wishes.
Besides, we're pretty much "glued at the hip" to each other these days, and opportunities to fully dress are essentially non-existent.