Sniffing my girlfriends farts

is it normal that i am obsessed with girls asses? i love the taste, the smell, and feel of girls asses! i love to spread my girlfriends ass and sniff it. i get the fattest boner from it. i wish she would go take a shit and let my clean her asshole and smell it. when we fucked one time she farted and i loved it and now i ask her to do it all the time, ill even blow into her butt so she does it the whole time in doggystyle. i love the smell of her farts especially when her bare asshole is on my nose and she farts. i have a feeling this is fucking weird.... haha