How often do you shampoo your hair?

I’ve listened to the song “Popular” by Nada Surf, and I remember hearing something in the lyrics about washing hair once a week…as if it were common for someone to wash their hair at least once a week.

And the other day when I was getting my hair cutt, the lady asked me if I was a daily washer. I was kind of confused by it, because I wash my hair daily and then thought to myself…why would anyone not want to wash their hair each time they shower?

If you do only wash your hair 1–3 times a week, what is the reasoning for it? Should I not wash my hair daily? Will it cause baldness, or any other sort of side effects? I for some reason want to think that women wash their hair less than men for some reason, but I’m not 100% sure.

Help me shed some light on this subject pleaaase =)