They always study women for these things in general, it’s dumb.
Beauty is not sexy, sexy is not beauty. Sexy is Hollywood culture and porn, but I repeat myself. Beauty is sexual dimorphism (extremes into their own sex, not a cross-breed), fertility and evolution. ‘Male beauty’ standards would wound too many egos. At least they can go to the gym for below the neck stuff, and you’ve seen the butthurt on height when it’s linked to healthier babies from superior childhood nutrition and hormone balance, as well as genetics.
Many factors here.
There is a hard limit on lip thickness based on the vermillion border and African lips need a masculine high-T jawline to hold the structure’s area size and weight, which neutralises the ‘gain’. They signal sexual maturity of the other lips, that is all. Jolie inherited hers from her father, and this is more common than via the mother, so it isn’t actually specific to women but men (like better nails and eyelashes, it’s unusual in women). A little plumper than her childhood ratio is an individual cue to fertility, not the supernormal exaggeration of cosmetic filler.
Women with a larger mouth require more filler to achieve the same fullness.
African lips also age terribly and sun burn worse. The wrinkles are aging and with tissue loss (aging), sagginess kicks in really quick (pillow lips, stretched natural skin container for artificial material).
Evolutionally, anyone who survived the Ice Age couldn’t lose more moisture than was absolutely necessary. As a mucous membrane, the lips require harsh upkeep and lose a lot of water as well as heat, to keep warm.
A small selection pressure.
This is the FEMME Marquardt beauty mask you never actually see, because they don’t use it.
The androgynous morphed male-female one is commonly used all over the place to brainwash us.
On the right is the same face by mathematics, with the angles smoothed into a skin-like surface using the neutral colour grey, as artistic midtone. THAT is the most objective female beauty standard.
Look at the area covered by that mouth. It’s a rosebud mouth, tiny BUT ALSO full.
Taut and youthful, but sexy, and not sagging.
Area covered is genetic, based on the width of the mouth opening, fullness by side profile is hormonal. Note the pronounced Cupid’s bow.
Science doesn’t give a fuck about your feelings.
Examples from Old Hollywood
Maximum area for beauty