Jez is a friend of cousin Martin, who's father to my goddaughters*, Charlotte and Isabelle, who're both aged seven.
Recently, Jez took his dog to the vet, who noticed the dog had only one testicle.
Didn't you know, asked the vet.
I don't spend much time inspecting my dog's genitals, replied Jez, who told this story to Martin, who related it to his kids.
Does that mean the dog's a lesbian, asked Charlotte.
*I'm enthusiastically athesist, but... well, it's a long-ish, dull-ish tale.