If you want to understand why your comparison is flawed, you need to look at the actual biology of what is happening in this photo versus what happens during sex.
That is a dilation chart.
The 10 cm hole at the bottom is what the body has to do to fit a baby’s head.
During birth, the body is flooded with Relaxin, a hormone that specifically exists to loosen ligaments and bones.
Without that hormone (which isn't present during sex), the pelvis is a rigid and bony structure.
Note: Relaxin and getting wet (arousal fluid) are not the same.
You mentioned "nonsense screaming," but for many women, they are dealing with Vaginismus. This isn't a choice; it’s an involuntary medical reflex.
Imagine someone tries to poke you in the eye, then you blink. You can’t stop it.
In Vaginismus, the pelvic floor muscles treat penetration like a threat and slam shut. It’s a physical spasm.
When you try to force past that, you aren’t just stretching tissue; you are tearing against a muscle that is literally fighting back. That causes excruciating pain.
gw inget banget dr. obgyn pernah bilang gini
“kalian tuh nanti harus berterima kasih sama bidan. kalau sama kita bintang 5, bidan tuh service excellent. bahkan ada ibu hamil yg ditemenin sampe lahiran. dibawain makanan minuman. saya kira keluarga pasien. ternyata itu bidannya”
This is Rapex, an anti-r*ping device for women. The woman inserts it like a tampon, with an applicator, and any man who tries to r*pe the woman impal*s himself on the barbs and must go to an emergency room to have the Rapex removed.