If someone is "good in bed", it means they're good at sex.

A person with an outwardly dominant, masculine, or aggressive personality, but who also enthusiastically takes on the submissive or "bottom" role in the bedroom.

a piece of literary GENIUS written by Jennifer Weiner (no, pervert ... its pronounced Way-Ner). synopsis-cized as follows:
"For twenty-eight years, things have been tripping along nicely for Cannie Shapiro. Sure, her mother has come charging out of the closet, and her father has long since dropped out of her world. But she loves her friends, her rat terrier, Nifkin, and her job as pop culture reporter for The Philadelphia Examiner. She's even made a tenuous peace with her plus-size body.

But the day she opens up a national women's magazine and sees the words "Loving a Larger Woman" above her ex-boyfriend's byline, Cannie is plunged into misery...and the most amazing year of her life. From Philadelphia to Hollywood and back home again, she charts a new course for herself: mourning her losses, facing her past, and figuring out who she is and who she can become"

The release of this book brought new meaning to the "chick lit" genre which previously consisted of smut novels and other various forms of girlish literary works - that THAT stupid boys!