Fungi has more than 7000 genders.
Humans have been discovered to have several sets of dna, (The term is chimeric dna) so essentially you have the sexes of these dna's. The sets are usually inherited from your parents and their parents, but stem-cells from a baby can travel back into a mother changing her dna so it also holds the dna of her child. In essence the sum of chimeric dna Means you have a lot of combinations of dna that can be put into your own children, so the sexes sort of blur out.