(September 2, 2015 at 12:39 am)IATIA Wrote: In and of itself, I take no issue with it. Live and let live. However, the problem I see with it is that it becomes socially acceptable and starts to run amuck and the number of children from these couplings will create issues for all.
I don't think it matters if it's socially acceptable. Most people have a natural aversion to sex with anyone they were raised with, not limited to biological siblings. I have seen this in my personal experiences and I'm pretty sure there's a link somewhere I'll search for it tomorrow.