Being forced to choose between male and female has particularly negative consequences. On one hand, it means that transgendered individuals are not welcome. On the other, it means that your identity impacts what you can do online. If you choose male, you may not be able to get into sites that are appropriate for you. If you choose female, you are likely to be harassed online.
Classification is dangerous online and needs to stop.
Please help us list sites that force you to classify yourself. Contact the managers of those sites suggesting that you are not pleased with their forced classification.