trustmc:
As for the congenital nature of homosexuality, I would submit that studies of identical twins with different sexual orientations disproves the inborn origin of this particular behavior.
Hello Mike,
I thought I would come back to you on the issues surrounding twin studies, because they certainly do prove the innateness of homosexuality.
Some facts, you can look them up if you want.
2% of the male population is gay.
48-55% of identical twins are both gay.
22% of non-identical twins are gay
11% of brothers are gay.
If there was not a strong hereditory component we would expect the normal rate to exist: that is if one twin was gay, then the other twin would have just a 2% chance of also being gay.
Of course, most people who think about the studies would expect that 100% of identical twins would would both be gay. But this is essentially an ignorant position. Not all genes are expressed automatically, some always produce an effect while others get triggered by environmental conditions. So identical twins may share the same genetic material but due to variations in environment not express it equally.
examples:
Type 1 Diabetes: If you’ve got the gene then each twin has about a 30% chance of developing diabetes.
Multiple Sclerosis: Normally your chance to develop MS is 1/3,000. If your identical twin has it it is 1/4.
Again if there where no genetic component you would expect normal incidence, not enhanced incidence.
Unfortunately, some of the fundamental assumptions in twin studies are mistaken, twins do not always share identical environments, in the womb there can be competition for food and oxygen due to sharing a placenta, the one who fights harder for these is in a different environment, environment triggers gene expression, QED… Outside the womb environment also diverges, environment triggers genes…QED.
The key point being that the assumption of 100% shared gens does not lead to 100% expression of genes. Thus, while some people would point to the ~50% rate of homosexuality as
proof of a non-genetic cause, they simply do not understand how genes work or the effects of environment.
While the switching on of genes is not certain, once they are switched on their effects are
inevitable.
Once you get diabetes, you have diabetes, no amount of moral fibre can stop it.
Once you develop MS you have MS. Again no amount of maral fibre can stop it.
So once the genetic component of homosexuality is activated, it is easily arguable that the outcome is inevitable.
What is the significance of this?
Inevitability and innateness would force a revisit to natural law. Arguments from design should be consitent, and if it can be argued that this is a result of design very good arguments need to be brought forward to deny it’s licitness. And, of course, the danger there is that denial of empirical evidence always damages the church and would bring in to question ofther doctrines based on design.