"i cant stop thinkin about poopin on people"

Hey I am a 21 year old male and ever since I was little I always fantasied about going number two on people and having hot wild smelly sex with them. I am now sexually active with my GF ( I am a man). and i really want to poop on her. I am sooooo scared to tell her because of the fear that she will break up with me. I try farting in bed to see if she likes it, but she usually doesn't. When I was a little boy I used to poop on a dinner plate and smear it all over my face, kids in school thought it was choclate, but it was sh*t. I really dont see this as being weird. but I have to ask is this normal....