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IME, I have yet to see a character concept that requires the character to be male or female. IMO, I honestly don't see how a player could need their charatcer to only be male or female that doesn't include elements that I don't care to have in a game I play for entertainment.
YMMV, probably does, and that's fine and dandy
Just going back to this one.
Would Ellen Ripley be exactly the same character if it was Alan Ripley?
Would the story remain the same if it was Steven Connor, father of John Connor, who was saved by a female soldier from the future, and said soldier gave birth to John but was killed by a Terminator?
Or, let's take a series where the character's gender was changed - Battlestar Gallactica. Starbuck in the original series was this kinda smarmy lothario style character. Kara "Starbuck" Thrace was based on the same concept, but was certainly female.
Gender can play an enormous role in character. Now, sure, you can play a female character that is constantly trying to submerge her feminine characteristics, but, that should come out in play.
And, yes, Nameless1 points out, it should be helped along by other players. But, the ball is squarely in the player's court first. That player has to bring it up in play because, if that player doesn't, no one else is going to, other than maybe the DM. And, really, why should the DM? The player is obviously not interested in making gender an issue, since the player never brings it up.
While I certainly like to roleplay with my players, I generally don't want to browbeat them into it.
And one of those ways, of course, is to play a woman who doesn't emphasize her femininity in any way. Asexuality is a viable option for character concepts, naturally enough. In these discussions about players failing to portray the opposite sex "accurately", it seems all too easily to slip into sweeping generalizations on how men or women should act, according to some set of conventions: "All men behave like this" or "No woman would do that", when common sense tells that somewhere in the wide world, right at this very moment, people are proving that false.
The old advice still holds true: play a complete person, not some stereotype of a sex or a gender, and it will work out all right.
But, again, it's a matter of degree. Gender, unless there is some species reason why not, is pretty readily apparent. There's a significant difference between playing against gender expectations and completely ignoring them entirely.
Even if your character is trying to be asexual, that most certainly SHOULD be brought up in play. That's something interesting about the character. That's a pretty strong trait. So, let's see it at the table.
That's all I'm asking for. If you want your character to have a specific trait, then play it.