Can men write women? Can women write men? [View all]

I know we've all had the experience of reading a book and rolling your eyes at how unlike the heroine is to every woman you've ever known. Men, substitute "heroine" and "woman" for "hero" and "man".
So what are some books where the author does do a good job portraying the opposite sex?
I'll start off.
"The Antagonist " by Lynn Coady. The narrator is a former hockey enforcer at a pivotal point in his life, which causes him to review his behavior and history.
Now, of course I am a woman, but I've read thousands of books by men, so I think that I'm able to recognize the male voice. I believed in the narrator so much that I had to look at the back photo to make sure Lynn Coady was a woman.
So - what good examples of opposite sex portrayals have you read?