The argument from epigenetics
The same genetic code can be expressed differently depending on chemical changes that take place before birth.
Existentialists believe people are free and responsible agents. They have a stake in their own development through their choices and acts of free will. Things which we cannot choose are not developed but assigned before birth.
We cannot choose our sexual orientation. We cannot choose who we fall in love with. As much as they might try to fight it, some people love people of the same sex. This would suggest that homosexuality is not something developed, but something pre-assigned before birth.
We can’t choose our personality traits either, but it does not mean we are born with them. Our experiences and environment shape us in ways we can’t control.
Enter the framing of the argument here ...
[P1] Free will gives us a stake in our own development. [P2] We cannot choose our sexual orientation. [P3] Therefore, homosexuality is not developed. [P4] Therefore, same-sex attraction must be innate.
[Rejecting P1] We cannot choose every aspect of our development.
Enter more information about the argument here ...
Content references here ...