Sister Sex?

I was chatting to Jazzer the other day and I asked him this hypothetical question. If you could choose a threesome between two hot sisters or two hot unrelated girls which one would you choose? Jazzer and I both came down on the same side by saying that you would have to choose the sisters.

Now obviously that is incest but i dont think that really had any bearing on our decisions. It really made me think 'am I just fucked up in the head', Or does that just not have to concern me. Is it the Sisters that have to worry about the taboo?. Anywho just a thought and if you would like to chime in you can write in a comment below!