I'm a guy and my two Skyrim characters I've played have both been female (Nord and Imperial). It's probably for deep psychological reasons I don't realize. But from a pure storytelling standpoint the journey of a woman as the Dragonborn seems less expected to me.
I'll get around to a male character eventually, but for the time being the idea doesn't really appeal to me.
Their muscles and the veins are repulsive. I don't wanna see that popping out of their skin like that. And they look so filthy.
I've never noticed veins or muscles, but I've never looked very close at them either. As for dirty... Well.... With the war and all there just isn't enough time for baths, I suppose.
Though, I often times use female party members if given the option. None of my characters are manly though (Unless I'm roleplaying a beffy warrior or something).
My follower preferences are the exact opposite of my player character preferences. Most of them are female and the ones who aren't are beast races.