I personally play both, I normally play more than one charater, so my set up will be sometihng along the lines of;
Warrior/DPS Mage - Male
Rogue/Priest - Female
I do not pretend to be a female, however I will play a female charater, When I meet a new person I normally tell them I'm a guy or they can tell right off. I play to enjoy a game, one of the points I like is looking nice, and I normally fine female players look better than male ones in the roles I have suggested above
In this day and age I find it is more likely to find a guy playing a female than a woman, I'm not saying females don't play games, I have many friends that do, but I shall never chat up or be flirty with a female charater online, because lets face it, you never know