I think they missed something. I read the paper, and partway through they have a set of merged images of all the gay and straight people of each sex. One thin

I think they missed something. I read the paper, and partway through they have a set of merged images of all the gay and straight people of each sex. One thing that jumps out at you is that the gay dataset is on the whole composed of people who are at least 20 years younger than the straight dataset. They're not seeing a horizontal difference, they're looking at a generational difference- my guess is that younger people feel more open about homosexual feelings, while older people see those feelings as shameful, and that's mostly what they've identified. It's the tank problem all over again, they're not measuring what they think they're measuring.