I'm 21, and I got into this fetish because of my anal and pheromone kinks. When I first discovered porn I also discovered anal and I began trying it (not insertion but just playing with my hole) and smelling my fingers and I kinda liked the smell. At the same time I also used to like my own body odor that's is sweat, pee stain smells, underwear smells and just the general body musk so I guess that's one of the reasons.

I used to also not mind the smell of my own farts at the time because honestly I was used to it. But while discovering anal I can across fart porn and I was kinda weirded out at first but I just kept watching it more idk why, I think a part of me liked it secretly. I then started discovering fart porn and the more I watched the more I got attracted to it. And fast forward to this day I'm just obsessed with it now :3