When I had these (I'm 75 now and officially too old for them) I found them painful.
I had breast cancer and the resulting scar has adhered to my chest wall. To get a decent picture, the breast has To be stretched out and the plates slammed over it before my breast springs back.
I always sympathise with the person doing the mammogram, as it's not easy for them,and it's painful for me.
I always tell them that I know it's going to hurt and they should keep on going unless I specifically tell them to stop. Which has never happened.
the bit that always amused me, in a grim way, is when they've got me in position ( chin up, hands clasped on the hand holds, naked and uncomfortable) they always say "now relax your shoulders ".
my shoulders are as close to my ears as they can get, because I'm in pain but I comply, because it's good for me 😂.
the bit about being half naked has never bothered me. Having had breast cancer twice now, I'm used to lobbing them out in front of medics. My breasts are just a part of my anatomy. Sometimes your body goes a bit wrong and the medics are there to put it right.