It's been said here many times before; No More Mr. Nice Guy is a good book with some good things to teach a lot of men, but the title really seems to put people off. I don't know whether that title was the author's idea, or whether it came from the publisher, but it wouldn't have been my choice.
On the other hand, from the publisher's point of view, it's an alliterative turn of phrase that's already part of popular culture, so every time someone reads the title aloud it already sounds familiar, and maybe they figure people find the odd title intriguing or "challenging." That's the kind of thing that may get easier as you show her that you're not looking for ways to hurt her or embarass her . . . or excuses to leave. She may be wondering about all three of those things.
