Euthanasia is an ethical choice.
Could wanting to end ones life for reasons other than terminal illness etc Be considered rational thought and not a sign of depression or other mental illness?
Life is pointless
Evolution by its very nature is random. While it may appear as though we are designed to reproduce there is no thought behind it, only natural occurrence. Just because it is what we do doesn't make it our purpose.
Men and Women are fundamentally different. Gender is not just a construct of society
Mammals and great apes display clear behavioural differences between the sexes. As we are also great-apes it is likely that we share this trait.