"...science says there are only two sexes."

Is "nothingburger" a term used frequently in your particular field of scientific study ?

http://www.joshuakennon.com/the-six-common-biological-sexes-in-humans/

"The six biological karyotype sexes....are :"

X – Roughly 1 in 2,000 to 1 in 5,000 people (Turner’s )
XX – Most common form of female
XXY – Roughly 1 in 500 to 1 in 1,000 people (Klinefelter)
XY – Most common form of male
XYY – Roughly 1 out of 1,000 people
XXXY – Roughly 1 in 18,000 to 1 in 50,000 births

Thanks for coming out, Mr. "Scientist"