There are two and only two sexes in sexually reproducing species

Only two sexes; two types of testicles 

One more time , sex in biology is how a species reproduces itself. At the cellular level in the gamete cells ( not the zygotes. Gametes are specialized reproduction cells. They multiply by miosis not mitosis as gametes do. There are two and only two types of gametes ,sperm and eggs, complementary opposites/ two sides of the same coin. The gametes cell type an individual has determines ones sex, male or female. Inter"sex"/ hermaphrodites in archaic terminology ( known about forever) have genitalia of both sexes; or there are "bearded women " of circus yore; and many other mixtures. But none with both eggs and sperm. And no individual can transfer from an sperm producing to egg producing.

These different gonads in one individual are _not_ sperm AND egg. It's two types of testicle in the same person

"abnormality drives the formation of two different gonads: an undescended testicle on one side, and a dysgenetic (improperly developed) gonad on the opposite side. Children with MGD typically have “ambiguous” genitalia, making it difficult to classify them as “boys” or “girls”. The two different gonads can’t produce normal sex hormones, resulting in malformed sex organs. " http://www.childrenshospital.org/conditions-and-treatments/conditions/mixed-gonadal-dysgenesis/symptoms-and-causes