Concerning people who can fart at will, an extreme example being the 19th century fartiste, “Le Petomane”:
People who can do this have an ability to draw air into the anus in order to expel it again as a fart. My question is whether this is an inate muscular trick which you are either blessed with or not, like the ability to curl your tongue, or something that most people could learn to do if they cared to, like swallowing air in order to belch.
There was a guy in a dormitory I once lived in who could fart at will, but he rather ruined the effect in that he had to manipulate his butt cheeks manually to get “pumped up” for the performance.
So, can one be tutored to toot?