Someone said :
The parameters used were - gender-atypical” features, expressions and “grooming styles” on a sample of 35000 men and women .
If they take a larger sample ( and there are millions of photos of gay people online)there will be many more parameters .
I'm sorry it's just, we're talking about parameters of a visual image of a human being.
Someone's homosexuality is simply not ascertainable by how a person looks once you remove social and psychological factors (grooming, expression and such) from the build of their face and body (their DNA, epigenetics and hormones).
This is a fact of... biology, and it can't be pierced just by upping computer power and widening sample pools.
You would probably have a better chance finding someone's orientation by a sample of their body odor, or a blood sample and even that's
far fetched, like, it'd be a slightly more believable sci-fi movie but still almost as unlikely as warp speed travel. At least it has a biological avenue to cling too not "scanning patterns and trends in the pixels of an image of a person".
Science isn't even sure yet exactly HOW people are gay. You can even have identical twins one of whom is gay and one of whom is straight (I know some).
The results posted are a false positive because the computer algorhythm is ran like a "dreamscope, line finder" which is picking up on the visual themes of a pool of people subtly and instinctively BRANDING THEMSELVES according to their orientation (and you can bet you ass that a LOT of those images, considering its a dating site, won't even be doing this subtly).
This programme will
not work on "regular" images. All you're going to be able to define is if someone has usually feminine eyes or a fancy hair cut, or a square jaw or a round jaw. Then what are you going to do? invent a "If you look genetically girly, your gay" machine?
There is no genetic link between looking girly, and being gay (and vice versa for all genders and orientations).
If you have a man with bright frigid, estrogen laces eyes with long legs and big hips, he could be straight as a arrow. You can have heavy set, deep eyed, colour blind bearded men with short little legs and a square jaw, totally homosexual.
It would at the very least need to be a ludicrously precise DNA test the likes of which the world has never ever seen before.