Depends how the character looks.
Also depends upon what I feel like playing for the character.
I think the whole "Hurrpp if i'm gunna look at butt, may as well be girlbutt" is kinda dumb.
Are you really that insecure?
YES OISTER, I'M TALKING ABOUT YOU.
Guy as long as the physique and physical appearance is attractive. If it's blocky and brute-like as in WoW, lol no thanks. Some classes I will usually go female, like Clerics and Thieves (Femme Fatale isn't Femme Fatale without a Femme). But I usually stick to my gender.
Games like FFXIV where guys (Miqo'te lol) are extremely good looking, yeah, I'll always pick male.