Why is that women always go to the toilet in pairs? I have a theory. Its all down to those super magic handbags that all women own, you know the ones that look small but are in fact bottomless and contain all things known to man, and woman for that matter. Hair-bands, rubber-bands, and economy size hair spray, safety pins, drawing pins Band-Aid, bandages, brushes for hair, teeth and nails, a small metal disc with bits of wire sticking out (don’t ask!), shampoo, soap, lipstick and lace. A spare pair of tights in case they have an accident and a spare pair of knickers in case they don’t. A mobile phone with no credit left on it Why I ask myself ? and a mirror, must not forget the mirror, ever!
The above list is by no means a comprehensive one but it does go someway to explain the age-old question of women go to the loo in teams of at least two. I think it's because they have to carry out an inventory of each other bags on a periodic basis to ensure they are not letting the sisterhood down.
Incidentally,this is also the reason why when you go holiday the womans suitcase is twice the size of the mans and why they take twice as long as men to get ready.