Is this implies that same sex sexuality began with primates, it’s wrong. It’s found in so many other species, including swans and penguins which aren’t even mammals
You just reminded me that swans can be gay. 😭
There are gay swarm couples who adopt other children. And about penguins, there is a picture book for children based on a true story about a gay penguin couple in a zoo
The research paper isn’t saying same sex sexuality began with primates, just that this research is only about primates.
Evolution does as well as it needs to and no better. There’s probably a downside or at least no upside to overspecifying gender based sexual attraction. I imagine it’s similar to the downsides in sexual selection seen in animals with specific and very strong sexual characteristics, such as those ungulates with crazy big horns.
The upside to sex (not gender) based attraction is reproduction, the fundamental drive of all life. Some forms of life, such as fungi, have more than two sexes, though they are only compatible with certain other sexes for reproduction. In humans, this becomes a little less relevant, as we are able to overcome the drive to reproduce even while maintaining the drive for sexual activity. There are still people that have a strong reproductive urge, however.
