This immediately reminded of fungi with thousands of sexes
http://blogs.discovermagazine.com/d-brief/2017/11/06/fungus-genders/#.XUMwkiZOQUE
(Sorry for the bit dodgy site, I didn’t quickly find a better source)
On a more serious note, sexes will be part of a more general caste system:
There’s already a lot of discussion about that.
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