Here's some very important information (or not), from a book called "The Dieter's Guide to Weight Loss During Sex":

Activity                     Calories burned

MAKING THE FIRST MOVE

Hiding Sex Manual                   3
Seducing partner                  
    If you are shy                  15
    If you are rich                  5
    If you are poor                164
Fumbling around                      4
Serious fondling                   14
Blowing in partner's ear
    Using mouth                      9
    Using bellows                   15
    Using blow dryer (low setting)   2
Blowing in your own ear            158

INTERCOURSE AND THINGS RELATED

Doing it for the first time       204
Doing it for the last time          1 1/2
Insertion
    If woman is ready               1/4
    If man is not                274
Positions
    Italian: man on top,
       woman in kitchen            26
    Russian: woman on top
    Man getting permission         55
    American: both on top          60
Intercourse
    Moderate                      15
    Heavy                         27
    Merciless pounding             50
    Blacking out                  125
Orgasm
    Real                           27
    Faked                         160

As for whether it works or not - who cares? Might as well experiment and have fun!

Jenny