Excellent question. I'm assuming you mean "freak in the sheets" in the complimentary sense, and are not referring to someone with two vaginas or a rogue digit growing out of her side.

Obviously, the definition will vary from person to person based on one's level of experience. Oral sex seems kinda freaky the first time you try it, does it not? That doesn't mean there aren't some universal qualities that most people would agree define the rare, prized "freak in the sheets."

Above all else, the FITS is confident. No shrinking violet in the sack, she loves sex and makes no bones (heh) about it. She's comfortable with her body, enjoys being naked, and doesn't worry about a guy judging how she looks or smells or tastes. She has no shame or hangups about sex -- she'll talk dirty, get busy with the lights on, pleasure herself while her guy watches. She knows she's good in bed, and loves to reaffirm it every time she gets horizontal with a guy.

This confidence allows a FITS to be adventurous and unafraid to try new things in bed. If she reads about a new sex position in Cosmopolitan, you can bet she'll be trying it on her man the next time they're naked. She's often the one to introduce toys or role-playing or even other people into the sexual relationship, and she takes great delight in being the first woman ever to _________ (insert semi-depraved sexual act) her guy. It's like the bumper sticker says: That thing your boyfriend does in bed? She taught him that.

The freak dan les fiches is also unpredictable in the best box-of-chocolates sort of way: you never know what you're gonna get, but you know you're gonna get it good. A FITS likes to shake things up, keep a guy on his toes. She might whip out a flogger one night and a fur glove the next. She might handcuff him or find a tiny little erogenous zone behind his left knee that he never knew existed. She gets tired of bed sex and will ask for a little sumpin'-sumpin' in the kitchen or the shower or on the hood of the car. In the driveway. On Saturday afternoon.

Finally, a true freak is passionate about sex, but I don't mean your basic, garden-variety passion that everyone thinks they possess. I'm talking about someone who is completely sold out to the sexual encounter at that moment, giving every shred of her body and soul and energy. A FITS doesn't hold back -- she's like the Tasmanian Devil 'twixt the bed linens. Whatever she does, she does it balls to the wall and without hesitation, distraction, judgment or regret. When you get with her, you'd better bring your A-game, sir, because she never leaves home without hers. When it's over, you might leave her bed sore, bruised, sweating, even bleeding, but you'll also be a sated ball of blissed-out goo.

There are other qualities that contribute to high sexual achievement -- selflessness, stamina, creativity, others -- but most fall under the big four listed above. And no one has them all, trust me, so don't think you fall short just because you aren't a world-beater in every category. I simply describe the ideal; how you pursue it in your quest for freakiness is, as they say, limited only by your imagination and your libido.