Hair has been studied quite a bit, and it's one of the few things where there are some truly objective differences observed among the ethnicities. Asians normally have straight hair, Europeans straight to wavy, Jews wavy to curly, African Americans curly to kinky. Since we're on a forum where most people are of European descent, I'm not surprised most poll results are straight to wavy.
It's important to get the right hair care products for your hair type. Though I'm of European descent, my hair is on the extreme end of wavy (2c); it's almost curly, and I used to classify it as such for many years before learning of the classification system:
Find the perfect routine to pamper your unique hair type and texture, tackling frizz, dead ends and more. Check out this guide for hair care tips by type.
myrevair.com
Many of the standard hair care products for "white" people don't work well for me; since I'm on the extreme end of wavy (2c), I need lots of extra conditioner so my hair doesn't get too dry or frizzy. I've found argan oil works wonders, and if I put leave-in conditioner with that after washing my hair (with both shampoo and conditioner), my waves stay hydrated and get far less frizzy.