I'm annoyed that my girlfriend cries during sex. Should I be?
Why are you annoyed she cries during sex?
Because it's so annoying and makes the sex less fun
You should ask why she cries during sex instead of being annoyed. A good partner is there for their loved one.
It's normal. You don't have to worry about it.
You just need to make sure you are there for her and her needs are met as well.