There's many things that have shown genetic links that don't occur 100% in one twin if it occurs in the other twin. The claim that "Because they have identical DNA, it ought to be 100%,” is BS.
And it doesn't matter what the cause is, all that matters in that whatever the cause it, it can't consciously be controlled. I really don't think all this effort in figuring out the cause matters; spend the effort on figuring out the cause of something that actually matters
Then it starts talking about that in teen years, a lot of teens who admitted to being gay, in a few years went back to being straight like it was some sort of social phase.
What is going on.
People who thought they were gay, people who were experimenting, biloveuals who decided they'd rather be with the opposite gender, people who were faking it for attention, etc
And yeah, as people have said, this is a religious website, and thus is not a good source for an issue such as this