• The [testicles] or [ovaries] -- in either case, the pair of organs which:

    a. Produce hormones which, prior to birth, cause the development of gender-specific traits, and at puberty, cause the development of secondary sex traits. [Testosterone] for males, [Estrogen] and [progesterone] for females.
    b. Produce gametes (sex cells) -- [sperm] in the case of males, [eggs] in the case of females.
    c. Make young boys giggle.