No one uses the word "Hen", except a small minority. And the minority who do use it are generally so obsessed with it they use it even when the gender is known, for example calling me, a male, hen instead of han, which I find insulting. If it's unsure what gender it is about or if it's a transsexual in question then sure, but it's rude to enforce it on everyone else. If it was just the bold part I wouldn't mind it, but it's not.
Isn't "he" considered gender neutral when no gender is specified?
But frankly, I can't stand seeing "he/she" or "they" for singular pronouns when gender is unknown. And "it" is for objects. I just pick "he" or "she" and move on.
i was not crying in the shower
i just realized how i'll never get to meet darth vader and then soap got in my eye - Kylo Ren
You should say "He/she opened the door."
it is also acceptable in some circles to say "He opened the door" even if you have no idea if it is a man or woman. It's similar to how you can open a letter with "Dear sir" as a generic introduction rather than "Dear sir or madam"
---------- Post added 2013-01-08 at 05:54 PM ----------
"However, it is generally regarded as a bad idea to mix the impersonal or generic pronoun one with another pronoun, especially in the same sentence, as in 'If one fails, then he/you must simply try harder.'
Humans are the only species on the planet smart enough to be this stupid.
The correct pronoun in the English language is 'They.'
Besides, 'Zhe, Zhim, Zher...' Sorry, but it sounds absolutely ridiculous; something from out of a children's magic book.