Someone posted a question over in GQs regarding whether the manly members of identical twins are identical. Interestingly, though, this poster added that it was REALLY IMPORTANT for him/her to know. Now, I did ask why, but it may be a while before I get the real answer, if ever. So, I call upon you all to help me think of reasons why it would be so urgent for this poster to have this particular tidbit of biological info.
My guess:
He/she is writing a murder mystery which turns on whether the killer can pass for his twin brother in EVERY way.
Who’s got a better one? (Hypothesis, I mean.)