It's not always about the instructor. Sometimes it's so the women can learn in an environment away from their male SO who may, while trying to be helpful by "translating" your instructions, make things more confusing and harder for her to concentrate.
When a couple brings the dynamics of their relationship into a classroom environment, it can impair the learning process.
And ego needs to be left at the door in any educational environment. "When you're green, you're growin'. When you're not, you rot."
No shame in not knowing it all.