There was stress as well throughout history so that argument is not persuasive.
The interesting fact that suggests nurturing is that the children of openly homosexual parents are 7 times more likely to become homosexual themselves. Adopted children, not linked by blood, mimic their parents. It is therefore chosen behavior but children don’t have the ability to make a choice - they are forced into it.
"Children of openly homosexual parents" is a 20th century artifact. How do you explain the other 8000 years?