ummm, again i think your confusing gender roles with actual gender. sex and gender are the same thing.

Dude, it's a definition, which means there can be no argument here. It's simply a way people chose to name some notions.

If you want to use other definitions, state them here.

"psychological and social" studies on gender roles is not based in science.

While I myself am often skeptical of social sciences, it's a fact, and a well documented one, that in numerous cultures there are genders (or in what appears to be your parlance, gender roles) beyond masculine and feminine.

the argument on why and how there are more genders then 2 is that gender is a social construct so it is not real. if social constructs are real then we only have 2 genders.

Your English is really beyond comprehension. What do you mean in this last sentence? That if gender social constructs are real then they must be the same as external sex characteristics? What do you mean by is a social construct so it is not real? How does it even follow?

i am only talking about the real.

What do you mean by real if social constructs are not?

yep, you have no answer for it? that's great you can say their is literature [...] you have not provided

Well, start here.