7 Signs She'll Be Good in Bed

It's an enigma as enduring as Mona Lisa's small, knowing smile: Sometimes meek women turn wild in bed; sometimes they just lie there, waiting to inherit the earth. Sometimes the chestnut filly with the riding crop turns out to be all packaging; sometimes she's as thrilling as the signs indicated she'd be.

It made me wonder: Is it possible to reliably predict what a woman is like in bed? The love scientists say yes—sort of.

"It's very hard to gauge," explains Helen Fisher, Ph.D., an anthropologist at Rutgers University and author of Why We Love, a new book about the nature and chemistry of romantic love. A woman's high heels, short skirt, and follow-me walk mean little. "Those are signs of intention. But they are not signs that this person is actually good in bed and is compatible with you."