The most likely reason we like the smell of our farts is simply because we habituate easily. That means that if we fart all the time—which we all do, around half a liter a day—we’re very used to the smell already, says Loretta Breuning, Ph. D., who writes about brain chemistry and the social behavior of mammals.
Why do I like the smell of old books? why do old books smell like vanilla.

Is it good to smell your own fart?

Smelling Farts and Your Health In fact, smelling your own farts can be good for you! There’s a compound within farts called hydrogen sulfide that gives them their rotten-egg stench, and it can actually be good for your health.

Why do I like smelling my own fart?

But our own smell is actually a sign of health. We’ve adapted to like our own odors, to help us maintain proper hygiene. We wouldn’t be able to take care of our own bodies if we were repulsed by them. Our own farts become familiar to us so we can maintain a higher level of well-being.