I no longer allow players to play their gender opposites. Since I put this “rule” into place about five years ago, not a single player I have played with since then has complained. What are my reasons for this? Well, I have a couple:
1. While I have I seen people play their gender opposites very well in the past, the number of times I have seen it done poorly greatly outnumbers the good portrayals. Suffering through the bad portrayals just simply isn’t worth it. I have been lucky to have many female players over the years, and while most of them have found it amusing to watch a guy play a woman at first, eventually it starts grating on their nerves (when done badly). Since I primarily DM, having players complain to me about other players ruins the fun for me, so anything I can do to keep it the players “harmonious” I am in favor of. (Now that I think about it, I have never had a female player want to play a male character, so I am not sure what that says about the male psyche.

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2. I not exactly sure what it really adds to the game. I realize that it is a fantasy role-playing game, but, just like real life, aside from some purely biological differences, there is nothing a male character can do that a female character can’t do, or visa versa. You can just as easily be cruel, heroic, sultry, sensitive, nurturing, and/or brutal playing either sex. If you really want to look at the world through a different set of eyes, be any elf, or a dwarf, or any other race besides human.
The handful of times someone has asked me of it was OK to play a different sex (they were always new to the group) the conversation always went something like this:
New Player: “Hey, can I play a female character?”
Me: “No, we talked about this already.”
New Player: “Aww, come on…”
Me (trying to give him the benefit of the doubt): “OK, why do you want to play a female?”
Then comes one of two answers:
Player Answer 1: “I have this great character idea…”
My Answer (after listening to a great, or not so great, character idea): “And why couldn’t a male behave this way?”
Player (after a moment or two of silence): “Well, I don’t know…I hadn’t thought about that.”
Or the player response with:
Player Answer 2: “Because it would be a fun change of pace…shake things up a bit.”
My Answer (realizing that there is 9 out of 10 chance he just wants to play a woman with loose morals): “No, give me a better reason.”
This then leads back to answer 1
I am sure some of you may disagree with my views on this, and if you like playing the opposite sex and do it well, I say more power to you. I would be interested in hearing how playing the opposite sex enhances your actual gaming experience, however. What can you do as a your gender opposite that you can’t do as your actual gender?