The pain of getting a PA isn't that bad, and it only lasts for a few seconds, and is immediately gone once the needle is thru.
Takes about 1-2 weeks for the initial heal, about a month for a complete heal, about 4 months before you can really abuse the hell out of it without discomfort.
The first couple times you pee may or may not hurt, and if it does, its more of a burning sensation than anything.
You will bleed initially, sometimes not much, sometimes like a stuck pig, just depends.
Whether you have to sit or not is highly dependant on what you wear in it, and how loose the piercing is.
You leave it in while having sex, what's the point in getting it otherwise? What it feels like is pretty much impossible to describe if you don't have one, tho I will sum it up as a nice exclamation point while having sex.
Sometimes just moving around, it will generate some really pleasurable sensations.
I love mine and wouldn't give it up willingly.
Downsides are not being able to have sex of beat off in any normal fashion for a couple weeks while it heals.
The hole becomes permanent after a time. Yes permanent. As in requires surgery or some googling, the ability to hack ones dick up oneself, and being able to deal with pain and blood to get it to close.
It can pinch sometimes, requiring some discreet adjustment of your junk.
They tend to be self stretching, meaning you need no effort to get bigger gauge jewelry in. This is cool initially, but eventually leads to a meatotomy. I'm lucky, mine is a bitch to stretch.