Gaudior: there seems to be a lot of subtle bias in this survey. I understand that it's not scientific and it's not meant to be, but the assumptions you are making are problematic, even if you're not meaning to make them, and even if you're not a social scientist doing hard research.

You may want to read recent discussions on surveyfail! for how other people made some of these same assumptions; because their assumptions are more blatant you can see problems with thier survey that are the same type of problems you have here. Since their assumptions are more obviously blatant, it is easier to spot the problem.

For example, the question "are you male or female?" contains bias against genderqueer, transgendered, or intersexed people. That biases your poll because those options are left out, in much the same way that leaving out option z in your poll biased your poll because an option that existed was left out.

I am not saying that the assumptions you are making are on the same level of horrible offensiveness as the assumptions that the surveyfail! people made and then had the gall to defend. But because your assumptions are less blatant doesn't mean that renders them unoffensive; unfortunately, the fact that they are less blatant means that you will likely find it harder to spot and squish them.