This is a great question, I plan on thinking all day on this one, but I do have something in mind that is an older book, so everyone may have read it. The Straight Man by Richard Russo. I am a 54 year old female and I loved this book so much, I suggested it to my 40 year old nephew, and he loved it as well. So that covers male, female and a couple of age groups. A newer book, Columbine by Dave Cullen. I have not read it yet, but my two nieces were fighting over it recently, one had started it before the other finished it. And from the reviews, I think men and women of all ages would find it interesting, although from what I hear a little difficult to read at times.Great question,I will be thinking of more suggestions through the day.

I'm currently in a co-ed book club. Some of it is more successful with the men, some better appreciated by the women, but we try to mix up the type of books we read and ask everyone in the group to keep an open mind.

Something that everyone liked The Hunger Games, by Suzanne Collins. Yes, it's a YA book with a teenaged female protagonist, but the story is very compelling. Another recent hit was Alas, Babylon by Pat Frank.

I'd consider some non-fiction titles that could generate some lively discussion about lifestyle.

Maybe too many of you have read it, but what about Michael Pollan's _Omnivore's Dilemma_ and/or his much shorter _Eater's Manifesto_?

How about The Devil in White City by Erik Larson. Another older one but a great one.

I think that California Gold by John Jakes might be one that males and females alike would enjoy.

I've got some oldies but goodies: John Irving's A Prayer for Owen Meany, Ender's Game, Count of Monte Cristo, Scarlet Pimpernel. If your group hasn't already read them, they should all have appeal with both genders

Our coed group just read Cutting For Stone. We also liked Unbreakable.

The Stieg Larsson trilogy (which gives you three titles) The Girl With the Dragon Tatoo/The Girl Who Played With Fire/The Girl Who Kicked the Hornet's Nest
I haven't had a chance to read them yet, but everyone I know that has, has liked them.