Have you ever wondered about sex change in animals? When there is an overwhelming imbalance of males to females, in some species the issue is resolved by some males turning into females. Now, this in itself is remarkable, but I wonder even more about the process by which the decision is made which of the males undergoes the chop, so to speak. 

If it’s voluntary, then I imagine the discussion goes something like this:-

Chopper:- Ahem, it looks like one of us had better do the right thing.

Choppee:- Well, it’s no secret that I’ve always fancied a bit of rough-and-tumble with the guys. Many’s the night I’ve lain awake hopping to get buggered. If this is what it takes…

If it’s involuntary, then the person who gets the chop is perhaps the one with the least to lose. (There had to be a joke about penis size. I had another one about the shortest straw drawing the shortest straw)