Yes. My brother and I did this often. But after a while I started making designs... not just scribbling and filling in with colors. and my colors were carefully chosen. Not just premade ones.. and just thrown where ever. I learned to be creative.
Porn use is detrimental to any relationship. It rewires the brain so that what is arousing is an image instead of a person. It is not only damaging to a mans sex drive but also to his wife, who is left violated and betrayed!