Chastity and orgasm denial discussion

Hello. I hadn’t really thought about PA until it clicked for me that genuine chastity requires it. A few quick queries:

1. Do cock piercings last forever? Can they be reversed if I decide later on that I don’t want the “hole”?
2. What are the likely and most frequent side effects of getting them done? Does inflammation happen a lot?
3. Which diameter is typically recommended?