The rules are pretty simple:
"Time: Contestants have about 2 minutes to perform an Air Sex routine. This can include all phases of an Air Sex encounter: meeting, seduction, foreplay and intercourse, or you can simply cut to the chase.
Music: Competitors must perform to music. You can either email your MP3 (along with your stage name) to Chris AT gmail.com, bring a CD of your performance track with you, or you can choose from our selection of Air Sex music.
Other Rules: Unlike air guitar, there are not many other rules. Props are allowed, groups are allowed. The only important rule is that all sexual climaxes must be simulated, not real, and you must have at least one invisible person (or object) that you are making love to."