KyuubiNoKitsune-Hime said:
Zontar said:
Eclipse Dragon said:
Wasted said:
Eclipse Dragon said:
Scarim Coral said:
Biological stand point, yes due to chromosomes. Female being XX and male XY.
If you define sex like that, where do you put the people who don't fit and the people with Klinefelter syndrome?
Having a Y chromosome makes a human biologically male since they will develop a penis and testis, regardless of having an extra X chromosome. The Y chromosome is the sex differentiator for humans.
Except that hormone disorders such as congenital adrenal hyperplasia can cause the body to develop incorrectly to their chromosomes, both early on and/or later in life.
Plus it begs the question of where XYY syndrome people like myself fall into it all.
Now there's no real difference to be observed in those who are XYY and those who are XY (hell, my doctor and I didn't even know until I had a test done that was unrelated to it).
Or how about someone like me who was born with XX Male syndrome?
Even with XX male syndrome, you still possess the SRY (sex determining region Y) gene on your second X chromosome. Normally that gene is attached to the Y chromosome, plus the other genes that bring about stereotypical male physical development. During crossing over in meiosis, it's possible (though exceptionally rare) for the SRY gene to attach to an X chromosome instead.
As for klinefelter syndrome, etc, from a purely technical standpoint, it's relatively simple: if you have a Y, you are biologically male. It doesn't matter if you're XXXXXXXXY, or if you have a completely female phenotype, you're still technically male. 99.999% of the time, Chromosomes determine biological sex, but really it's the genes associated with those chromosomes that actually determine sex.
So in other words, even with XX male syndrome, you still possess the 'male genes', so you are biologically male. Even intersex humans are still technically male or female, but obviously you can't look at a person and know what their genotype is.
TLDR, for purely biological purposes and when we're talking genotypes, yes there are only two human sexes, but it doesn't have much to do with your appearance, and gender is a separate issue.