There's a script in porn, with the girl who moans in pain and the guy who doesn't make a sound as he goes back and forth, apart from a grunt when he comes.

It took me years to understand how exciting it is for your partners to get feedback, and how important it is to say what you like and what you want.

And about announcing when you're coming: yes, always. It lets your partner know that it's not the time to change position or slow down (unless you have a kink for ruined orgasms), it keeps them from choking if it's during a blowjob (again, unless it's a kink, but I never met someone who likes to gag), and overall it lets them choose how they wants to handle the mess.