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It's hard to qualify it, but it's like how you can tell if a room is a boy's room or a girl's room, or if clothes are boy's clothes or girl's clothes. You notice a pattern - this avatar has elements x, y, and z and belongs to a male; this avatar has elements a, b, and c and belongs to a female; this avatar has elements a, b, and c and belongs to a female; this avatar has elements x, y, and z and belongs to a male. When you come across another avatar then, with elements x, y, and z, you tend to think that the avatar would belong to a male.
You're making the mistake of applying inductive logic! :o Don't you know that Hume showed induction could not be logically justified?