I do it on occasion because I like cute characters, hairstyles, and armors.
This is why I have played a Tarutaru for years (Male) on FFXI and never once regretted my race choice. Something like WoW does not satisfy this with the male characters, so do I want to be the disgusting muscle bound dwarves, the old wrinkly gnomes, the Night elves with huge shoulders, or pretty much every Horde race? Tauren were kinda cute though, despite their bigness..I had one of thems.
The females are of course drastically the opposite in terms of muscle (Generally), most of them don't fit into what I liked either since I'm not really too fond of remote controlling an armored lingerie model, but it's significantly closer to what I desire when creating a character.
Not only that but most of the female hairstyles seem to have more thought put into them, and with less 'silly' or 'wacky' styles to sort through. Armor seems to be better designed when latched onto a female, but it could just be me mentally appreciating the figure (Oogling) more than the armor.
Give the male characters some more chances to be cute instead of just badasses or muscle heads. ;;