Axa

now you're missing the semiotics, cause in english and particularly in social sciences sex and gender are two difference concepts:
gender - the behavioral, cultural, or psychological traits typically associated with one sex
sex - either of the two major forms of individuals that occur in many species and that are distinguished respectively as female or male especially on the basis of their reproductive organs and structures

...of course what consitutes 'real' is only our own perception and belief, thus your assumption that there are two real gender is also reliable, since it is 'true' to you as an individual and as a product of your society and upbringing :)