Like most
candies, chocolate eggs were designed to look like either male testicles or the male buttocks.
Only the perverts who make chocolate eggs have taken the sick innuendo a step further, and filled them with "creme."
If you need any closer analogy to testicles, just take two creme-filled chocolate eggs and stick them in a sack, and then tell me that Cadbury isn't just begging for young children to join the homosexual lifestyle and orally service black men.