I made a habit of writing "he", when refering to someone. Today it's not uncommon to write "he or she". Some even make a point of doing just "she", or "xir", or some other retardedness. Why should I though? Just "he" is much faster to write, and makes sense since it's mostly a male hobby. Women are welcome to play my games, it's just rare I think. You gotta think about the demographic.
Here's a quick lesson in the language, since you're not a native speaker and because even most native speakers have been mis-educated. English has no specifically male pronouns. It only has the generic "he" and the female-specific "she." Here are a few examples of correct usage.
When the player makes his attack roll, he should use a 20-sided die.
The player is a non-specific person, and is therefore referred to using the inclusive generic pronoun "he." In this case, "he" and "his" can refer to any human being, regardless of gender.
A couple more related examples to demonstrate the pattern that runs throughout the language:
That's one small step for a man, one giant leap for mankind.
In the first part, Neil Armstrong was referring to himself ("man"), while in the second part he was referring to the entire human race ("mankind"). Feminists would have you believe he was intentionally excluding females, which is patently absurd.
...to boldy go where no man has gone before.
"Man" in this sense means the entire human race...unless you think Captain Kirk meant to exclude females from space exploration.
On the other side of the equation, "he or she" is actually incorrect, because it's literal meaning is "any human being regardless of gender, or a female human being."
This pronoun mutilation is all based on a myth promulgated by people who either don't know what the truth is, or don't care. If I were you I'd do it the right way, but if you do it the right way, you'll face discrimination from people who have accepted the myth as orthodoxy. There are a lot of folks who've been mis-taught about this, and if you run into a true-believer, don't be surprised if
he explodes into rage if you try to correct
him. I've seen it happen.
If you're going to do it the wrong way, you should at least realize it's wrong.