Well, DS's hair isn't straight, but it is long and curly.When I wash it in the bath, it's below his shoulders, but it curls up a ton when dry. He's 17 months and hasn't had a haircut yet. (I do trim his bangs when they get long enough that they are in his eyes.)
I just love seeing boys with long hair or hair with personality!
DH, my mom, my MIL, pretty much everyone except one friend of mine is always on my case about cutting his hair. I refuse to get his hair cut right now. Once those curls are cut off, they might never come back.
I just don't get it. He's a baby. I don't understand what the big hurry is to rush him into the barber and get his hair cut super short so he'll look like every other 1 1/2 year old boy in America. 
Yes, he gets called a girl by strangers. I don't mind.
Between the long hair, the teething necklace and the girly carriers I wear him in, I totally understand why people think he's a girl. Once he is old enough to decide for himself, I'll happily take him to get his hair cut if that's what he wants. Til then, I suppose everyone around me will need to get over themselves. 
Here are a couple of pics from a few weeks ago:
Slicked back and tucked behind his ears.

And the back:

One more:

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