Answer:
I am not a toy though many use me for pleasure. I have a butt but I cannot poo.
I go through a door but never go in and never come out.
When it comes to me, you go on red and stop on green. What am I?
Sometimes I am white, sometimes I am dark. Most people love me. What am I?
Every dawn begins with me. At dusk I'll be the first you see and daybreak couldn't come without. What midday centers all about. Daises grow from me I'm told. And when I come I end all code but in the sun I won't be found. Yet still each day I'll be around.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.