Q: Our children were given two rabbits, and they’d like to know each bunny’s sex before they name them. We parents would like to know, too, so we don’t end up with a house full of rabbits. How do we tell what sex each rabbit is? If one is female and the other male, can they be neutered to prevent a household population explosion, or should we just try to keep them apart? A: One way to determine their sexes is to look at each rabbit’s groin. A male, called a buck, has a penis with a circular opening and two cigar-shaped testicles. A female, or doe, has a slitlike vulva. A far easier way to sex your new bunnies is to schedule a physical exam with a veterinarian. If your new rabbits are not yet sexually mature, it will be particularly difficult to determine their sexes without your veterinarian’s …