Thread:Robert Mcneary/@comment-38953622-20191012013202/@comment-366087-20191014042244

2 different things
 * Male
 * Female

2 different things
 * Airport
 * Carport

different things (and not counting umpteen other varieties)
 * Cheddar Cheese
 * Swiss Cheese

2 different things
 * Baking soda
 * Baking powder

2 different things
 * Note
 * Musical Note

If you have thing and type-thing/thing-type, you have (at least) 2 different things.

Thus, At least 2 additional genders.
 * XX Male is different from Male
 * XY Female is different from Female