TBH Hamish doesn't yet know he is a boy as he has shown no interest at all in sex so I am tempted to leave his existing testicle in place. I will discuss this in more detail come his booster in February. He used to have the occasional hump at a long furry cat door stop I have but he hasn't bothered at all with it for a good while, he is more interested in feeding his face with food than the S word.
