This is likely to be a contentious thread, please keep it civil, remember everyone is entitled to their opinion.
There is no end of threads and posts regarding the lying surrounding crossdressing. The biggest area is about "not telling the SO" and how this is lying to them.
Well to put the cat amongst the pigeons, I don't believe that the CD'er is lying if they do not tell their SO.
Now before you burst a blood vessel, how can you lie about something that the other person does not know about? If you do not tell you surely are deceiving rather than lying.
To give an untruthful answer is lying, but to give an answer you have to have a question.