There's a reason why most D/s, M/s, etc relationships are kept quiet. It's not the thrill of mystery that keeps this things closeted for the majority of us, imo.

You don't go through day to day life recounting in detail what happens in your house. Even if the woman who asked you is was polite etc, you're not required to satisfy her curiosity. Sad as it is to say, but no one has to care about other peoples' business, nor they should.

The choice to share or not is yours alone, or as denu puts it, it might be up to your Owner/Master.