The male reproductive system consists of two major parts: the testes, A person's sex is determined by what reproductive system the person. The external sex organs may not match the internal sex organs or genetic sex. Babies who are genetically female (with two X chromosomes) may have: Whether people with ambiguous genitalia can have children. Internal sex organs for both genders. External genitalia that are partly ambiguous . Chromosomes that are either normal female or male, or a mixture (mosaic).