You Make Your Position Clear.

"Mom, no: this is inappropriate!" You exclaim forcefully. "You're my MOTHER, I can't be talking to you about this!"

Something in your tone makes her pause... "Why not?" She asks after a second.

You blush to the roots of your hair but are determined to put this matter to rest once and for all. "If we start discussing our sex lives it changes our perceptions, we will see each other as sexual beings instead of family, potential partners, even though both of us are already in a relationship. You won't just be my mom but a hot and experienced mature woman as well. That's not something I ever want to think about again, so please, remember what you always told me when I was younger and first discovered masturbation: 'Private things are for private places.' What you and dad do on your 'dates' is none of my business and should stay that way!" you declare.

As you've been talking, your mother's face has been filled with a roiling stew of emotions, shock, horror, disgust, fear, anger, sadness, and sudden understanding...