"A strict dichotomy between genes and environment is no longer relevant; they work in concert," said Nancy Segal, a psychologist at California State University, Fullerton, and herself a fraternal twin who has made a career of twin studies, starting with the famous Minnesota Twin Family Study. A study of 4,000 pairs of twins in Sweden found that genetics has a stronger influence on sexual orientation in male twins than in female twins. Segal, who has also written "Twin Misconceptions: False Beliefs, Fables, and Facts About Twins," said the studies highlight the importance of keeping twins, especially identical twins, together when they are adopted.

Is this conclusion from "What Twins Can Teach Us About Nature vs. Nurture." Brody J 2018 august 20 THE NEW YORK TIMES is viable?