Women's reactions when they find out you are bi?

I'm extremely fortunate. The only woman who knows that I'm bi is my wife and she is okay with it. In fact she is happy about it. She is in her mid 60's and her sex drive has dropped off considerably. As a result she is glad that someone is taking up the slack so to speak. As long as it's a man she is fine with it but I had better not take up with a woman. She sometimes even wants to hear the details of when I get together with who she describes as my boyfriend.