All that waiting...
Men and women
shop very differently. While there are always exceptions to every rule, generally speaking men tend to go in with a pretty clear idea of what they need and where to get it. Bingo-bango, pay for the item and you're back home in no time.
Women, on the other hand, tend to go shopping with only a general objective and take their time browsing through various items that may be unrelated to the original goal - leading to a lot of VERY miserable-looking guys waiting around for them to finish.