Tilting Saddles?

I’ve heard there are saddles that can be tilted to different angles. Why would thatbe a good thing?

Not everybody’s crotch is the same shape.

Or, in other words, why would it be a good thing on a bicycle?

Because of different riding styles…

personal preference, depends on what style you ride

Basically, a different saddle tilt can drastically affect the way you ride, i.e. weight distribution, pressure spots and friction. It can also promote better posture.
It’s a very touchy thing though; I think that to get a worthwhile result of it, you would need to go through a lot of trial and error, because it can also introduce stress to areas that don’t usually undergo stress.

It has a biggest affect when you’re long distance riding.