[Sans-Culotte]

The article talks about biological sex. In biology and human biology, there never has been just two biological sexes, male and female. The concept of there being only two sexes, male and female, is a social convention and is not a biological reality or a scientific reality.

So, how many are there?

[HiTech RedNeck]

This would probably be better snickered at than flared at in a huge outrage.

[WhiskeyX]

“So, how many are there?”

Beginning with the broader classes you can start with:

1. chromosomal or genetic sex;

2. Endocrinological or phenotypic sex

3. Gonadal sex

4. Hormonal sex

5. Morphological sex

6. Nuclear sex

Each of the above major classes include multiple sub-classes, some of which have a presently unknown number of genetic variations.