That's just a matter of anatomy and reproductive tracts, and people could choose whatever gender they want if they weren't forced by society into categories of either male or female the way South Africa used to force people into categories of black or white.
那是一个解剖学上的问题， 生殖道的问题， 人应该对他们的性别有选择权 而不是被社会强行划分为男性或是女性 就像南非过去把人划分为黑人和白人。