actually
since not all genders have "testicles" (by definition testicles are part of the male anatomy)
you have to have 51% of 9 million
4,590,000 males
9,180,000 testicles
Today I found out that there are more than 8 billion people on Earth, that means there are at least 9 billion people; That means there are at least 18 billion human testicles on Earth, but we should count animal testicles too