Well, do you get these random pockets elsewhere, big enough to eject projectiles?
Mind you, I did see that guy on tv the other night who could fart by sucking air up into his bum through some serious sphincter control, before expelling it "musically"........
or indeed
Seriously the article seemed to say that you may or may not be at a greater risk during the first week of menstruation, but if you are this is increased by taking the pill.
Still think the circus trick is more interesting though........
Lou