Men don't want to advertise that they are asking for anything other than the "normal" cut when they visit the barbershop. It seems to be an unspoken rule, one that the barber knows very well. He knows exactly which celebrity hairstyle each man is quietly asking for and how to cut their hair accordingly.
Celebrities and magazines are a great source of finding a hairstyle for long hair as many celebrities change their style regularly. If you are looking for a new style which is in fashion and trendy, watching what the celebrities are doing with their hair on the red carpet is a perfect way to do this.