Some adults including myself and yourself are into diapers because our brains are wired to like the feeling of the diapers.
Diapers are a turn on sexually as they are great when they are wet.
When the diapers get wet they make for good masturbation and you don't even need any lube.
However some people are just into the diapers for comfort and not for sexual reasons although most people do get sexually turned on by diapers and that is okay.
Diapers also just feel very good to wear and I wish I could wear them everyday but right now cannot afford to do so.
I find diapers to be much more comfortable than underwear and I hate using toilets as well.
When you're wearing a diaper you can just pee and poop in the diaper without any need to find a toilet as the diaper is your toilet.
Diaper Fetishism is the name and term for being turned on by diapers.
There are many types of fetishes and diaper fetishism is one of the tamer ones.