At least with TP orientation there are enough people who do it the "wrong" way (i.e. not the way your family did it when you were a kid) that you probably will have seen it done that way at a friend's house.

More interesting, I think, are questions about things that are done in private so you may have no idea that the way you do them is not universal.

Around 20 years ago, some gaming site had an advice column, and occasionally someone would write in with a question that had nothing to do with gaming. One such question was from someone who said he and a bunch of friends were sitting around talking about random things, and somehow the topic of which direction to wipe came up. Top to bottom or bottom to top.

The questioner said that all of his friends went one way, and he went the other, and now they all think he is a freak. He asked the columnist about this.

She asked around the office, and found that everyone there did it the way the questioner's friends did.

I asked my friends, and the majority matched that office but there were some who did it the other way.

Unlike TP orientation, it had never even occurred to me that anyone would pick the "wrong" direction.

That leads to the question of what other things that are normally done alone can be done in different ways, and am I doing those things in the best way?

For a while after that I seriously considered subscribing to one of those "voyeur cam" sites where they have one or more people living in a house (typically barely legal aged girls...) with 24/7 web cams in every room so subscribers can watch everything the residents do, not for the usual erotic reasons but simply to see if other people were doing private things better than me.