Mother sex issues. Any advice appreciated.?

At 16 my mom chastised me for having sex and told me in the scheme of things, it "wasn't important." Now she's a widow, and encourages me to leave my husband constantly. It's her problem. I'm not going to change her. All I can do is resist her ideas, which I don't agree with. Your parent's sex life is none of your business, and you should stay out of it.